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Solve : System Always Turns Completely Off Without Warning?

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I just recently purchased all the hardware parts I need to put together my own computer. The last time I did this was over 8 years ago so I spent all of the weekend reading up and studying what needs to be done.

Everything is put together in the chasis, and the only parts that arent new is the chasis, and a Hard Drive (which is fully wiped of data, just an older one I had). When I try booting up the system, everything seems fine; But after about 1 minute, the system just suddenly shuts off completely. No error, no internal beeps or alarms, nothing, just a complete and immediate shut down. It doesnt matter if I'm loading the windows install, in the Bios screen, or just sitting on any screen it will always shut down randomly. It has done this approximately 12 times now.

The Parts:
MSI P55M-Gd41 Motherboard
Intel i5 750 2.66ghz (P55 LGA 1156) Processor
Diamond Radeon HD5750 1GB
Corsair DDR3 4GB (2x 2GB) [PC1600C7] 1600Mhz RAM
Corsair TX650W Power Supply

ASUS CD/DVD R/RW Drive (SATA)
Maxtor 60GB HDD (SATA)

I intially tried it with an older Power Supply, so my first guess was that (of which I now have the Corsair one listed). It's having the same issue. Then I thought maybe it's a heat issue, so I cleaned the Thermal Paste from the CPU with a lintless cloth, nice and clean and applied some new Silver Thermal Compound ("Formula 5" by Antec") but I watched it from the Bios monitor and it's SHUTTING down with a CPU temp in different areas, and only around 70-76*C. I've tried reseating the RAM, and the V-Card.

Mobo Above the V-Card
http://img109.imageshack.us/i/mobo1.jpg/

Mobo Below the V-Card
http://img195.imageshack.us/i/mobo2u.jpg/


Any ideas? I've exhausted so many ideas disconnect everything from the mainboard that is not essential for booting. Remove the hard drive, cd/dvd drive, if theres onboard video, try using that. Try to get it to stay on while in bios setup. USE only one stick of ram. Try resetting the bios also. Quote from: rif on May 23, 2010, 05:21:03 PM

disconnect everything from the mainboard that is not essential for booting. Remove the hard drive, cd/dvd drive, if theres onboard video, try using that. Try to get it to stay on while in bios setup. Use only one stick of ram. Try resetting the bios also.

Alright, tried removing non-essentials. I literally only have the 4-pin ATX, the 24 pin power, the V-Card, and the fans plugged in, along with the Power Switch cable to the case. Same result. As far as the RAM, the manual for the Mobo seems to tell me it doesnt work with just one, it says it needs either 2 or 4, but I will try that in a moment. Resetting the Bios is something I'm not familiar how to do. Is this like clearing the CMOS by changing the jumpers back and forth? I should have mentioned I tried clearing the CMOS already. No on-board Video for this Mobo.I watched it again from the Bios monitor, and the only thing I can see that looks strange is the CPU Vcore. The Voltage being used by the CPU starts at around 1.026, and steadily drops. When the system finally shuts off, the CPU VCore is around 0.8V. Could this be part of the problem? It's not the PSU itself, as it's doing this on 3 different PSU's that I've tried. BIOS likely has a temperature monitor, could it be set too low? Also, are all the voltages set properly for the CPU being used?It is very possible the temperature monitor is shutting down the pc as 70c to 76c is not exactly cool. I think that is a tad high? Yea, looks like it might be a heat issue after all.

http://img228.imageshack.us/img228/9328/mobo3.jpg

This is how I've put the compound on. After I took this picture to initially show here, I secured the fan back on and noticed one of the LEGS was a little messed, and after I pushed it back in the right position it locked down even TIGHTER than before. I tried running the computer again (At this time I've taken the system out of the chasis and have it resting on a non-conductive surface) and it's been running on the BIOS H/W Monitor for about 2 minutes, as well as the entire time I've been typing this and was at 38*C when I started typing.

Edit: Now I look at it it's up to 77*C, it just took a while to get there. The CPU Vcore is around 0.9 V though,

Edit2: The Temp got to 78*C and the CPU Vcore dropped to 0.848V now, still on

[7:54pm] Edit3: I took a picture of the Bio H/W Monitor and literally 10 seconds after, it finally shut down

http://img217.imageshack.us/img217/9181/bios1.jpgI've been looking at your manual, p.3-14, same page as pic. Why is CPU FAN speed = 0rpm?
CPU Temp=85degC will shut it down. That's your problem-overtemp

BTW, nice motherboard, cpu, etc. It's protecting itself, just the way it was designed to.

Manual

Your CPU has a Max TDP of 95W, and should be able to run at a temp of 85degC. I've got a 3.0GHz, P4, single core that has the same TDP and it will run at 85degC all day long. The fan is set to run at 100%.oh wow :facepalm: Yea that last run would have worked if I didnt miss one of the pins for the fan. I can't believe I didnt notice that last time. Beginning next test, the fan is running 2030 RPM now (it was 2002 RPM when I started having this problem) let's see how it does now.

You guys have been amazing help

I will PROBABLY spend my next paycheck improving the cooling system. It will work now.

Look at my last edit: Your CPU has a Max TDP of 95W, and should be able to run at a temp of 85degC. I've got a 3.0GHz, P4, single core that has the same TDP and it will run at 85degC all day long. The fan is set to run at 100%.

It runs hot because it's running Seti-At-Home.

Here's the specs for your CPU: http://ark.intel.com/Product.aspx?id=42915Yup, it's been running quite well now. I will end up improving the cooling anyway because this Mobo has a built in Overclocking feature "OGenie" that people have been reporting being able to boost this specific Processor to 3.1ghz, but I assume that will increase the heat being produced. Better safe than sorry.

Again, thanks a lot for all you guy's help. Maybe it'll be worth sticking around this community for a while.Quote from: Elixibren on May 23, 2010, 07:26:01 PM
Yup, it's been running quite well now. I will end up improving the cooling anyway because this Mobo has a built in Overclocking feature "OGenie" that people have been reporting being able to boost this specific Processor to 3.1ghz, but I assume that will increase the heat being produced. Better safe than sorry.

Again, thanks a lot for all you guy's help. Maybe it'll be worth sticking around this community for a while.
I saw all the overclocking features in the Manual. Overclocking will increase the heat, but the standard fan may be enough. You can monitor temp & voltages while in Windows with CPUID Hardware Monitor. You can also install CPU-Z.

There's always someone here. Your issue seemed obvious after you posted the BIOS pic. Sometimes, you're just too close to notice the "little things".

BTW, you can also upload pics directly to CH. When you type in the "Message Box", click Additional Options.


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