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First of all, Sorry for my bad english.

So I have very old PC.

Mainboard - Spacewalker , or something like that.
Ram - I have 2GB of ram, but only half are working. It is because my mainboard doesn't read other side of RAM plate i think.
CPU - AMD 2000+, or something like that.
Video card - GeForce 6200 256MB 64-Bit.
Hard Drive - Western Digital [WD] 40GB.
CD-RW drive.
Sound - Sound Blaster Live.
Internet card - I don't know.

The beggining of the problem:
I was playing Live For Speed [ It's a game ] And it was running without any problems, on 60 fps. Then computer shut down without any signs. I thout it was electricity problem, but monitor was still turned on.
Later i tried to turn on the computer but i won't turn on. It's like he doesn't get electricity. Well i took off allmost every part of the computer and cleared out from dust and trash. Then i put everything in and it's still the same. Computer lights blinks for a second, cooler starts to spin and everything is over in about in half of second.

I don't know what to do...
Can anyone say what happend?

HELP PLEASE !!!

Hi Wooxie.
This is Fransis.
I am hearing these kind of problems occurs to most of the people. The problem is not other than your main board. There are many possibilities, like the old system you say and may be it does not getting proper power supply to it. The mother board got faulty due to insufficient power. It could be that some of the part like transistor or some of the related diode may be burn or short-circuited in it. Or there should be the cable fault. So after the complete check out of the system you can have the better solution on that.
Thanks and have a great time.

1. Is the case speaker attached to the motherboard?
2. If so, does it beep, if so how many beeps, and are they long or short beeps?
3. In the motherboard manual, make sure you've actually connected all of the front panel devices correctly (eg USB headers, case speaker, power & reset switches etc).
4. Remove both memory sticks. Try installing one then attempt to boot the PC, if that fails try the other one. PC's don't boot if the memory isn't working. Usually this is accompanied by specific set of beeps at boot up.
5. Try re-seating the graphics card (if there is one), and try to reboot.
6. Disconnect all hard drives, and any DVD/CD drives. Try booting. If you get to the BIOS screen, then one of those is not working. Try booting with each one connected independently until you find the one that isn't working.
7. Does the motherboard have an integrated graphics card? If so, have you accidentally connected the monitor to it instead of the add in card? If you have got an integrated graphics card, and you also have an add in card, try removing the add in card and try booting with the monitor connected to the integrated one.
8. Is the power supply switched on at the back? (believe it or not this accounts for over half the repairs I've ever made).
9. Remove any PCI cards and try booting. If it boots, add them in one at a time until you find the broken one.
10. Is the CPU fan turning? If not that will be what's stopping it from booting...
11. Try re-seating the CPU. Not for the faint hearted though, especially not for those AMD's. There's a good chance you'll break the CPU socket trying to get the heatsink and fan off. Make sure you apply some new thermal paste if you attempt this.

If none of those work.....

12. Buy a new PC.

Thanks for help. I got the fix.

12 one helped.

''12. Buy a new PC. ''