P45 MS-7516 worked great for 2 years, suddenly won't post.

MB: P45 Diamond MS-7516 (v1.0)
CPU: Intel Core2 Quad Q9550
RAM: Tried many types in differing slots.
PS: Antec 500w
Video: ATi HD4850
This setup worked great for close to two years, and today it suddenly won't POST. Immediately after pushing power button (most) all of the MB's LED indicators light, no beeps, no video output, but all fans spin. It stays like that until I turn off power supply.
Here's everything I've tried so far:
I switched out memory, tried one stick up through four in all configurations.
I checked power supply with DMM and all is correct.
I tried 2nd power supply (375w).
I reset CMOS, the correct way, via battery and jumper.
Triple checked all connections.
Removed MB from case and set on cardboard.
Reseated the CPU and tried a different heatsink.
The labels on the MB's LEDS are very hard to read. Can't really see which numbers line up with which lights. It looks like pretty much all of them are on.
1 on and blue
2 on and red
18-22 (top right) all on and blue
4 on and red
9-16 (that whole 4 group thing) Each group has one Red on.
And there's a few more I'm leaving out. Basically they're all on.
I don't know if this is relevant, but immediately before this problem started (remember pc worked great for 2 years) I was booting up Linux off a Sandisk thumbdrive. Ran into some boot issues, hard reset, and then wouldn't reboot or even POST from power on.
There have been no power surges or electrical storms.
Judging from my process of elimination, I think it must be the CPU or MB. I'm hoping I don't need to replace both. Any ideas?
Thanks

Thanks, that makes perfect sense.
But given that this MB worked for so long with one PS, and just out of the blue stopped working, and that another PS (one which the store uses specifically to troubleshoot) was tried, and that all other components (RAM, VGA, CPU) have been replaced and the MB still has same behavior, it seems extremely likely that the MB is to blame. Am I wrong in that assumption?
I'm also assuming, from the lack of responses regarding the MB's diagnostic LEDs, that having them all lit is not a meaningful code. Is that assumption correct?
Thanks all!

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P45 MS-7516 worked great for 2 years, suddenly won't post.

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