XFX 650 watt PSU
1 stick Patriot 2000mhz ram (2 gb)
It'd be worth carefully re-checking compatibility because the Intel memory page for your board makes no mention about RAM this fast being supported by the board: Intel� Desktop Board DP43BF System memory
Thanks for the reply. After reading about the ram problems with this board on this forum, I started suspecting the ram, too. But on the other hand, that ram was working fine on that board until last week. And I've tried some slower ram and get the same behavior. Finally, if it was the ram, wouldn't I get the memory error beeps?
Maybe the memory error beep speaker is broken - does it beep with no memory at all? I don't know why this ram worked apart from possible backwards compatibility (most ram will often run at slower speeds for the sake of compatibility). Just because you got it to work for a short time, perhaps the voltage was wrong and killed it (and the board/CPU) over an extended period? Lots of possibilities but one things for sure, from the info you've provided, that ram is not to spec and shouldn't have been used with this board.
The first thing you should do is ensure all your components are 'to spec' (no ifs and buts) when trying to get it working again. If rectifying the memory does not fix the problem, then its time to consider the other system components. Check out the Intel no-boot wizard on their website.
No, it doesn't beep when no RAM is installed. It had worked with heavy daily use for about 7 months until last week; what's more, wouldn't it be odd if the error beep speaker and another component (whatever is preventing it from posting) failed at about the same time?
In any event, I have returned the board to Intel under an RMA. I've also ordered some RAM that's to spec, as per your advice.