power supply (?)

[eulogy]

Power supply?

I’m not totally sure what’s wrong with my computer.
I have a PM8M-V motherboard
3.0Ghz p4 CPU
2 GB RAM
6200 Graphics card
Raidmax Stagitta case w/ 420W power supply.


I had everything set up in a case and got it to turn on in the BIOS but I lost interest and didn’t do anything with it for awhile. When I came to revisit I found that the power supply had died so I bought the new case.
Well, it’s not turning on. Sometimes (about 20%) I’ll get the lights to come on the front for half a second, the fan sounds like it’s starting and then nothing happens.
The power supply is set correctly to 115V. I don’t have a multimeter, though I suppose I could get one if I had to.
Does this sound like it’s most likely a power supply problem, or did something happen to my other components? Maybe I magically don't have something hooked up right? I've checked and re-checked a million times though.

[honvetops]

 Suggestions: (1) You may want to consider purchasing 184-pin DIMMs along with your motherboard if your existing memory is not of this type. (2) Be sure that you are using a Socket 478-compatible processor with this motherboard.

3.0Ghz p4 CPU  pretty damed sure thats a775  cpu~socket..........  look here 1st, then Listen to Patio  or the hidden GX1-Man   



MSI PM8M-V - motherboard - micro ATX - P4M800

CNET product brief

The MSI PM8M-V is a VIA UniChrome P4M800-based, PC motherboard. Compared to other PC boards on the market, it is very inexpensive at around $50. This motherboard supports Pentium 4 and Celeron processors that use the Socket 478 interface. This board supports up to 2GB of memory.