I used my computer this morning and i came home from work and tried to use it again but it keeps saying the monitor is on power save mode. I tried moving the mouse, using the keyboard, turning the monitor off and on, unplugging it, turning off the tower etc. I switched to 3 different monitors along with switching between the video input on the MOTHERBOARD and the video card(custom built so i have 2 ports) and still cant get it running. What could be wrong?Clear CMOS. Remove the CMOS battery from the motherboard for 10-15 minutes, then place it back in there.


There might also be a clear CMOS jumper on your motherboard. Check your manual.
Make sure you are grounded before touching any internal components. Static electricity can fry your motherboard!yea i did that along with removing the video card and starting it for 2mins then turning it off. When i did that also for fun since my computer was having a hard time turning on i changed power supplies and now it works so i dont know what it was.  Only thing tho is the NEW power SUPPLY, the main connection that goes to the motherboard only has 20pins where as the old one has 24pins. will that make a difference and how do i know for sure if its plugged into the right spot or does it not matter? I MEAN its running and im using it right now.Well it is possible to use the twenty pin connector on your motherboards twenty-four pin port. However, this is risky as the board will be underpowered (especially if you have an AMD CPU). This could lead to several problems regarding you boards stability and overall performance of your machine.

What happens if you put the old power supply back in?
If that the old PSU was the cause of your problem, then you should start looking for a new one.

 yea im not sure what cpu i have as my cousin built this computer and i bought it from him, all i know is its a 2.93ghz haha. My old power supply is dead i think. When i would PLUG it in my computer would turn on for a sec and shut off, i couldnt even use the power button to turn on. With the new power supply i have no problem turning on or off.  Im looking right now for a new power supply but not sure what exactly i need. Not sure of the brand of the old one but the model number is win-400psMake sure that new one has the twentyfour pin connector. Don't get some cheap thirty dollar special. This is one of the most important components in your computer, so don't' get cheap. You need one of equal or grater wattage than the old one.Thanks for helping out. Will all power supplies have the same amount of connectors? and what are the benifits of getting a more powerfull power supply?