Hi
My pc keeps shutting down while windows is starting up.
I have an amd athlon 64 cpu (i know its old) with 2 ddr2 rams. One is 512 mb, the other is 2gb. My graphics card is 256mb ati.

I have managed to start my pc before after it shutdowned a few times. But I cant start it anymore.
I know it has nothing to do with my os, because I tried to boot linux slax and it again shut downed.

What is the problem with my pc. How can I fix it?

Are there any errors? Can you boot into Safe Mode and then check Event Viewer? Unfortunately, this could be caused by any number of things, which makes it that harder to troubleshoot. I always like to start by knowing I am feeding my system good power. Here's my canned text on testing the PSU.

To properly and conclusively test a power supply unit (PSU), it must be tested under various realistic "loads" then analyzed for excessive ripple and other anomalies. This is done by a qualified technician using an oscilloscope or power analyzer - sophisticated (and expensive) electronic test equipment requiring special training to operate, and a basic knowledge of electronics theory to understand the results. Therefore, conclusively testing a power supply is done in properly equipped electronic repair facilities.

Fortunately, there are other options that are almost as good. I keep a FrozenCPU Ultimate PSU Tester in my tool bag when I am "in the field" and don't have a good spare power supply to swap in. While not a certain test, they are better than nothing. The advantage of this model is that it has an LCD readout of the voltage. With an actual voltage readout, you have a better chance of detecting a "failing" PSU, or one barely within specified ATX Form Factor Standard tolerances. Lesser models use LEDs to indicate the voltage is just within some "range". These are less informative, considerably cheaper, but still useful for detecting PSUs that have already "failed". Newegg has several testers to choose from. All these testers contain a "dummy load" to fool the PSU into thinking it is connected to a motherboard, and therefore allows the PSU to power on, if able, without being attached to a motherboard - great for testing fans, but again, it is not a true load or suitable for conclusive testing.

Note the required voltage tolerance ranges:

NOTE: Disregard the -5VDC reading. It is no longer used.

Swapping in a known good supply is a tried and true method of troubleshooting used for years, even by pros. If you have access to a suitably sized, spare power supply, carefully remove the suspect supply and replace it with the known good one, and see if the problem goes away.

I do not recommend using a multimeter to test power supplies. To do it properly, that is, under a realistic load, the voltages on all the pins must be measured while the PSU is attached to the motherboard and the computer powered on. This requires poking (with some considerable force) two hard and sharp, highly conductive meter probes into the main power connector, deep in the heart of the computer. One tiny slip can destroy the motherboard, and everything plugged into it. It is not worth the risk considering most multimeters, like plug-in testers, do not measure, or reveal any unwanted and potentially disruptive AC components to the DC voltages.

The voltages can be checked in the BIOS Setup Menus of most motherboards but they do not reveal ripple or other anomalies either. And the Setup Menu places very little demands on system resource so, like the temperature readings found in BIOS Setup Menus, they may not reflect values obtained when the computer is processing demanding tasks.

And remember, anything that plugs into the wall can kill. Do not open the power supply's case unless you are a qualified electronics technician. There are NO user serviceable parts inside a power supply.

I dont think there are any errors. And I cant start safemode.
Thanks for the help. Ill definately get the psu checked.

Keep us posted.

Thanks for the help
I finally got my pc fixed

Went to the PC repairing shop, and they said its the mobo. It does make sense. I couldn't boot up anything, so it was probably the mobo.
I changed the mobo and its working fine now.

Great! Glad you got it sorted out and thanks for the follow-up.