Booting up problems!!!

Hey guys, I have an old computer that I'm trying to boot up. I've upgraded it little by little for nearly 5 years now. I took apart the chassis and air sprayed it since it was full dust. I cleaned some of the case fans as well. Now, I've had issues before where it wouldn't turn on, I use to think it was the power supply. After, a couple of weeks it finally stopped booting up. I bought a new power supply thinking that was the problem but I was wrong. The green light on the motherboard is on and all the connections are where there suppose to be. My only guess now is either between a dead motherboard or processor. What do you guys think?

System Specs:

Mobo: p4p800-mx
PSU: 575 W
CPU: Intel Pentium 4 processor 3.0 Ghz
Memory: DDR 400 at 4 Gb
GPU: Sparkle 9400 Gt 1 Gb PCI
OS: Windows XP Home Edition (32 bit)
4 answers Last reply
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  1. i'd rather think about a dead MoBo
  2. grossemesser said:
    i'd rather think about a dead MoBo

    So would I. The computer itself is sort of ancient. If it's a dead mobo or cpu....I'm just gonna scrap it.
  3. If I can get some help here, I would really appreciate it.
  4. Our standard checklist and troubleshooting thread:

    My guess is either PSU or motherboard. The green LED really does not mean that much.
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