Q150 randomly freezes, now won't POST

Hi guys - we have a Q150 that we're using as an HTPC/NAS on our network. It has two external USB drives connected, one of which is HFS+ (with MacDrive running to read it), both of which are shared on the network for our WD TV Live to access. Recently it has started to freeze up completely, requiring a hard power cycle to restart. Frozen mouse, etc - just totally locked up.
Now, it will power up, the power LED comes on, and I hear the CPU fan running, but it doesn't get any further. No POST, no BIOS stuff, nothing. No beeps either.
This makes me think CPU, memory, or MB. What do you guys think? Unfortunately I don't have any spare parts laying around to test this since the Q150 is so proprietary, other than the memory.

Well, after waiting a few hours, the computer booted again, and made it into Windows. Then about 4 or 5 minutes later, it froze again. Tried to boot, and it made it to the Windows startup screen, then froze, with the HDD LED still blinking. Tried to boot again, and this time it's back to the first scenario - no POST, no beeps, nothing. What could cause this kind of behavior? It's definitely not a heat issue since the computer had only been on for a few minutes when it froze, and the case was completely cool to the touch. But why would it fail to boot/POST, then make it all the way into Windows just by waiting a few hours?

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