Computer turns on then shuts off.

https://www.google.se/search?q=grub+bootloader&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:sv-SE:official&client=firefox-a
can any of this help ?

CPUs dont use drivers they are pre-booted hardware item. Meaning any changes are made from the bios firmware.

do you hear any bios beeps at all? is the cpu fan running? and make sure you got the power coming from the power button hooked into the right header on the mobo

Any of the heatsink/fan assembly provided by Foxconn will support you're CPU.
http://www.foxconnchannel.com/product/Coolers/series.aspx?series_id=en-us0000008&series_name=INTEL
Socket LGA 775. See manual pages 7 to pages 9.
Main web site; http://www.foxconnchannel.com/product/Motherboards/detail_overview.aspx?id=en-us0000201
This motherboard supports single processor including Intel® CoreTM 2 Duo,
Pentium® 4 Extreme Edition, Pentium® D, Pentium® 4, Celeron® D processors in
an LGA775 package.

Cheers'
Mike

Vendor Type FSB Frequence
Intel Pentium Northwood 400MHz 2.0, 2.5GHz
Intel Pentium Northwood 533MHz 2.4-3.06GHz
Intel Pentium Northwood 800MHz 2.4-3.0GHz
Intel Pentium Prescott 800MHz 2.8GHz
Intel Celeron Northwood 400MHz 2.0-2.4GHz
Intel Willamette 400MHz 1.8GHz
Intel

In 19 years of working on computers I've seen 1 bad Intel CPU and it still worked it just showed the wrong processor speed. I'd eliminate the CPU being the problem. Generally if you have a bare system with motherboard, ram, keyboard and video and they turn on the system is good. The video may cause a crash if it's bad somewhere in the bootup process going into windows but it shouldn't stop the initial bootup process. The area I would likely suspect is the hard drive. If the arm inside the drive that controls the heads is loose it can cause the drive to read sometimes when cool and then to start slipping and not read when the system is warmer. If you can get into the bios there should be someplace there to check your temperatures and voltages. Those might be a suspect area. If the power supply isn't delivering the proper voltages or the CPU is getting hot could cause problems also. I'd like to hear more about what you're seeing on the screen when this system fails to boot. Does is show the ram countup, system devices and hard drives as detected in the bootup process? Or is the screen just blank. When it doesn't boot does the hard drive light blink continuously?

The reason for this is because you CPU needs to run only at 1Ghz at that particular moment. see the more programs you run, the more processing is needed. No if your computer is on Idle then the or have programs like word or excel running the processing is less. so the CPU automatically reduces the processing speed. this way the CPU is energy efficient. you have nothing to worry. this is a feature that Intel has added to the newer generation of CPU's

I don't like to post links but this may be a better help then trying to explain here.

http://forums.anandtech.com/messageview.aspx?catid=28&threadid=2057083&enterthread=y

Good Luck

Well it sure sounds like an overheating problem, and 77 degrees celcius is way too high, specialy if it's right after boot! try reseatting the heatsink and make sure the repair place put a thin coat of heatsink compound paste on the processor. You need to bring that number down so really pay extra attention to the heatsink.
The next thing would be a bad memory module check out http://www.cas411.com/ShowArticle.aspx?ID=66 , it talks about surprising behaviors of PCs when a memory goes bad.

Hope this helps!
Alex J.

I would agree that 50% of the time you may get away with putting a working Hd with windows on it to run when changed to another board. When you change your motherboard, there are certain entries in the system registry that are looking for the components of the old motherboard. If the registry does not find these components, the system can become unstable.
The fact that you got windows to some what start is a good sign for the Hd. Try setting the CD as first boot device & have your windows XP in the drive. Do a format & install. I'm sure windows will install. Since you have three boards all the same you will only have to do this once. Foxconn warrants all Mb for life. You can always call at 580-272-0035
Mach Speed Technologies, Inc.
110 East 10th Street
Ada, Oklahoma 74820