Solve : Computer Overheated will not turn back on?

1.	Solve : Computer Overheated will not turn back on?
Answer» Specs: OS: Windows 7 64-bit Motherboard: MSI NF750-G55 AM3 NVIDIA nForce 750a SLI ATX CPU: AMD Phenom II x4 3.2 GHz PSU: Corsair TX750 RAM: G.SKILL Ripjaws Series 8GB GPU: MSI Twin Frozr II Geforce GTX 560ti Story: While playing Rust my computer overheated and shutdown. I built this computer four years ago and while this has happened a few times over the LAST year, all times before this I could turn it on and it would be fine. I pressed the power button and instead of turning on the light near the power button flashed. I felt on the side of my computer where the CPU was located and it was hot. Not scalding but still pretty warm. I turned off the PSU, unplugged everything and proceeded to dust out my computer. Once it had cooled down I plugged it back up and it did not turn on, even the lights near the power button did not flash. It made a slight sound similar to the sound an older television would make before the picture showed up, but that was it. Next I tried to see if anything was broken by unplugging the RAM, GPU, hard drive and disc drives from the motherboard and then trying to turn the mother board on and start from there. While the standby light on the motherboard was on the fans were not. I cant exactly remember why but I unplugged a cord labeled jpwr2 located near the CPU and heatsink and when I pressed the reset button on my computer the fans turned on. I plugged everything except for the jpwr2 cord back in and the fans included the fan on the heatsink and one of the fans to the GPU would still come on. The lights on my mouse would come on and the lights on my keyboard would flash once but then stay off. On the motherboard when the PSU was powered on the standby would turn on, once the reset button on the computer was pressed the standby light would turn off, the before mentioned fans would turn on and at the top of the motherboard, near to ICs labled CPU phase there were four lights in a vertical row, only the topmost or first light blue light would be on during this time. Conclusion: I am unsure as to what exactly is causing this to happen. I don't know what I must replace or if there is some fix that can be applied. Any help would be greatly appreciated. You really need to read the documentation fort your motherboard. Find out what thing USES the other 12 volt plug. Here is a link about power connectors on motherboards. http://www.informit.com/articles/article.aspx?p=31105&seqNum=4 Best guess is that you have a graphics card that failed. Thank you for responding.While I found and read the manual for both my Corsair power supply(http://www.manualslib.com/manual/378402/Corsair-Enthusiast-Tx650.html) and my nf750-g55 motherboard(http://www.manualslib.com/manual/398411/Msi-Nf750-G55-Motherboard-Atx.html) I couldn't make out exactly what else used 12 volts besides the 24pin connection for the motherboard and the 4pin connection for the CPU.Also, I completely disconnected my GPU, but that doesn't SEEM to have changed anything.Looking in the motherboard manual, JPWR1 is the main 24-pin connector. The standby light would remain on whenever the motherboard was receiving power. This does seem like a power supply problem. When a system is off, but plugged into power- the Power supply will provide a 5v standby rail to the system, as well as a PS-ON signal. The standby 5v is what powers the "standby" light on most motherboards, which is more or less an indicator that the system is receiving power. The power supply doesn't provide other voltages until the PS-ON pin is grounded. This is done by the power switch- you press it, the connection is grounded (by bridging the connection between the PS_ON signal and a ground wire), the voltage drops on the PS_ON Rail to the threshold (around .8v according to the spec) and the power supply turns on. The voltage can be manipulated by software control as well, thus why systems can "turn themselves off". If your fans turn on and the main ATX connector is not connected, then I think the power supply may have failed, or is at least having issues. Fans run off of 12v power on a rail that is not supplied until the PS_ON signal is grounded. Thing is, if you have the ATX Connector unplugged, it shouldn't be grounded. I don't think the motherboard could be involved given that with the ATX connector unplugged the motherboard couldn't be shorting out or grounding the PS_ON pin in any way, but the fans suddenly turning on when you press reset (which is something that the motherboard handles) is incredibly odd. THe best approach is usually the process of elimination by using known-good components. I'd start with a second power supply first.Thank you for your response. While I am still trying to find a power supply with enough wattage for my board and CPU(most of the other desktops in my home where store bought nearly a decade ago), I found out that I had switched the power and reset switch pins while messing around with the motherboard. This at least explains why it would turn on when I would press the reset button. Now it properly turns on when I press the power button instead. Quote from: kendread on June 29, 2015, 04:42:00 PM I am still trying to find a power supply with enough wattage for my board and CPU That one you have is more than sufficient for the parts you have, no need to replace it. Glad you got it sorted though.Oh no, I'm still having the before mentioned problem, I just realized I switched the reset and power button on the motherboard. It still wont turn on with the 4pin power connected. The only power supplies I can scrounge up right now are 20 pins instead of the 24 I need and none of them go above 240W while the motherboard manual says to try for at least 350W for stability. While there might be other FACTORS that might have caused this state (most likely, a PSU in this case), you also do have to watch out for overheating in the future after you eradicate the problem, as an overheated component might be the reason for the broken part in your computer that prevents booting up. Overheating can be caused also by: 1. inadequate or old thermal paste on the CPU or GPU (you will have to know the CPU temperature for that); 2. fans blowing into the wrong direction (check that they are all circulating air through the components by LIGHTING a match inside carefully; 3. overall overheating from dirt and dust (clean your PC like advised at http://visihow.com/Clean_a_Computer_Tower); 4. cheap or broken CPU or GPU cooling system (check the temperature again and replace with an expensive one. It also happens often on overclocked systems); 5. bad cooling of the HDD drives or memory (that happens rarely but does); 6. excessively overclocked CPU or GPU (tone it down).

Answer»

Specs:

OS: Windows 7 64-bit

Motherboard: MSI NF750-G55 AM3 NVIDIA nForce 750a SLI ATX

CPU: AMD Phenom II x4 3.2 GHz

PSU: Corsair TX750

RAM: G.SKILL Ripjaws Series 8GB

GPU: MSI Twin Frozr II Geforce GTX 560ti

Story: While playing Rust my computer overheated and shutdown. I built this computer four years ago and while this has happened a few times over the LAST year, all times before this I could turn it on and it would be fine. I pressed the power button and instead of turning on the light near the power button flashed. I felt on the side of my computer where the CPU was located and it was hot. Not scalding but still pretty warm. I turned off the PSU, unplugged everything and proceeded to dust out my computer. Once it had cooled down I plugged it back up and it did not turn on, even the lights near the power button did not flash. It made a slight sound similar to the sound an older television would make before the picture showed up, but that was it. Next I tried to see if anything was broken by unplugging the RAM, GPU, hard drive and disc drives from the motherboard and then trying to turn the mother board on and start from there. While the standby light on the motherboard was on the fans were not. I cant exactly remember why but I unplugged a cord labeled jpwr2 located near the CPU and heatsink and when I pressed the reset button on my computer the fans turned on. I plugged everything except for the jpwr2 cord back in and the fans included the fan on the heatsink and one of the fans to the GPU would still come on. The lights on my mouse would come on and the lights on my keyboard would flash once but then stay off. On the motherboard when the PSU was powered on the standby would turn on, once the reset button on the computer was pressed the standby light would turn off, the before mentioned fans would turn on and at the top of the motherboard, near to ICs labled CPU phase there were four lights in a vertical row, only the topmost or first light blue light would be on during this time.

Conclusion: I am unsure as to what exactly is causing this to happen. I don't know what I must replace or if there is some fix that can be applied. Any help would be greatly appreciated.
You really need to read the documentation fort your motherboard.
Find out what thing USES the other 12 volt plug.
Here is a link about power connectors on motherboards.
http://www.informit.com/articles/article.aspx?p=31105&seqNum=4

Best guess is that you have a graphics card that failed. Thank you for responding.While I found and read the manual for both my Corsair power supply(http://www.manualslib.com/manual/378402/Corsair-Enthusiast-Tx650.html) and my nf750-g55 motherboard(http://www.manualslib.com/manual/398411/Msi-Nf750-G55-Motherboard-Atx.html) I couldn't make out exactly what else used 12 volts besides the 24pin connection for the motherboard and the 4pin connection for the CPU.Also, I completely disconnected my GPU, but that doesn't SEEM to have changed anything.Looking in the motherboard manual, JPWR1 is the main 24-pin connector.

The standby light would remain on whenever the motherboard was receiving power.

This does seem like a power supply problem.

When a system is off, but plugged into power- the Power supply will provide a 5v standby rail to the system, as well as a PS-ON signal. The standby 5v is what powers the "standby" light on most motherboards, which is more or less an indicator that the system is receiving power. The power supply doesn't provide other voltages until the PS-ON pin is grounded. This is done by the power switch- you press it, the connection is grounded (by bridging the connection between the PS_ON signal and a ground wire), the voltage drops on the PS_ON Rail to the threshold (around .8v according to the spec) and the power supply turns on. The voltage can be manipulated by software control as well, thus why systems can "turn themselves off".

If your fans turn on and the main ATX connector is not connected, then I think the power supply may have failed, or is at least having issues. Fans run off of 12v power on a rail that is not supplied until the PS_ON signal is grounded. Thing is, if you have the ATX Connector unplugged, it shouldn't be grounded. I don't think the motherboard could be involved given that with the ATX connector unplugged the motherboard couldn't be shorting out or grounding the PS_ON pin in any way, but the fans suddenly turning on when you press reset (which is something that the motherboard handles) is incredibly odd.

THe best approach is usually the process of elimination by using known-good components. I'd start with a second power supply first.Thank you for your response. While I am still trying to find a power supply with enough wattage for my board and CPU(most of the other desktops in my home where store bought nearly a decade ago), I found out that I had switched the power and reset switch pins while messing around with the motherboard. This at least explains why it would turn on when I would press the reset button. Now it properly turns on when I press the power button instead. Quote from: kendread on June 29, 2015, 04:42:00 PM

I am still trying to find a power supply with enough wattage for my board and CPU

That one you have is more than sufficient for the parts you have, no need to replace it. Glad you got it sorted though.Oh no, I'm still having the before mentioned problem, I just realized I switched the reset and power button on the motherboard. It still wont turn on with the 4pin power connected. The only power supplies I can scrounge up right now are 20 pins instead of the 24 I need and none of them go above 240W while the motherboard manual says to try for at least 350W for stability. While there might be other FACTORS that might have caused this state (most likely, a PSU in this case), you also do have to watch out for overheating in the future after you eradicate the problem, as an overheated component might be the reason for the broken part in your computer that prevents booting up.

Overheating can be caused also by:

1. inadequate or old thermal paste on the CPU or GPU (you will have to know the CPU temperature for that);
2. fans blowing into the wrong direction (check that they are all circulating air through the components by LIGHTING a match inside carefully;
3. overall overheating from dirt and dust (clean your PC like advised at http://visihow.com/Clean_a_Computer_Tower);
4. cheap or broken CPU or GPU cooling system (check the temperature again and replace with an expensive one. It also happens often on overclocked systems);
5. bad cooling of the HDD drives or memory (that happens rarely but does);
6. excessively overclocked CPU or GPU (tone it down).

Solve : Computer Overheated will not turn back on?

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