Thanks to all that have responded. I don't think the hard drive is at fault, because I did not get the flashing question mark at startup. I also tried booting from a different hard drive and that produced the same symptoms. Same thing with trying to boot from a CD. I'm thinking that it could be bad contacts, but I've opened the case and removed whatever dust in there with compressed air (I'm actually quite sick of opening and closing the case so many times today). Whenever I get the mac to startup successfully, sometimes there are intermittent freezes during the startup process. This goes away after a while. Everything works fine for about an hour, and then it would freeze solid, necessitating a restart. This isn't the first mobo to die on me. I've had one that died and this was its replacement. However, now that it's dying again, could there be something wrong with my power supply that is frying the mobos?
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