Power shut off after 2 min.

[kydflash]

I installed a new PS in my computer. A PowMax AG 480 Watt ATX PS. It is a little bigger than the old one. It replaced the original 350 Watt PS. I also installed a new MoBo, a AsRock K7vm2, and a AMD 2800 Barton CPU. I turned on the computer,and it shuts itself off after about 2 min. I need to unplug, and the replace the plug to power it up again, and then 2 minutes later shut off. There is no warning and no error. Is the PS to big, or does it not fit the MoBo. I don't know alot about MoBos and i was worried maybe the PS is wrong for the board. Any help is appreciated. I could try another PS but i need to remove from my wife machine, and it's only a 250 watt. It's a 5 y/o gateway. If you think that is a good first step say so. Thanks

[123456]

Welcome to the PCGUIDE!

I don't really know about this, but try to check your CPU temperature in BIOS by pressing the F2/F1/Delete key, (depending on your BIOS).

[kydflash]

OK, i powered it back up, and found the screen you told me about. It shut off when the CPU temp. hit 60 deg. Cel. Is that to high. i put a new fan and heat sink on the CPU. it shouldn't be having a problem. Did i need to use some type of thermal paste maybe? I didn't when I installed the fan. Th

[123456]

60 degrees is very high.
The normal is 20-40 degrees.
I don't know about thermal paste... :(

[pave_spectre]

Thermal material is absolutely needded.

If you used the heatsink that came with the processor, it should have had a thermal pad on the bottom, which you may have needed to remove a film from before installing.

If you used a different heatsink then you may need to purchase a seperate thermal material like AS5.

Without thermal materia,l overheating and killing the processor is a very real risk.

[jlreich]

Yes the only thing keeping your CPU from frying is the mobo shutting it down when it hits 60C. I'm surprised it lasts two minutes. Thermal grease fills in the tiny imperfections in the surface of the CPU die and Heat sink to allow proper thermal transfer.

If you bought a new heatsink/fan it should have come with some thermal grease(small packet of white stuff), or pick up some Arctic Silver 5 (http://www.newegg.com/Product/Product.asp?Item=N82E16835100007) and follow these instructions. http://www.arcticsilver.com/arctic_silver_instructions.htm

I wouldn't turn the machine back on until you take care of this. ;)