Quick question: What causes a MB not to POST BUT fans, HD light, CD lights all start up. See this morning I woke to my computer being off (generally runs 24/7). Not lately this isn't totally unusual as I have been experiencing intermittent startup problems. The shut down has usually been caused by automatic updateds in XP. Forced reboot has failed a few times in the past. Anyways originally (today) I couldn't get it to start (AT ALL, no post ect). I unplugged it and let it sit for awhile. Put the power cord back in. Turn on the power suppy, and before turning on the computer, the CPU fan, starts, case fans start, platters in the hd start to spin ect but zero post. Nothing, no signal to the monitor. Tried a new power suppy (common problem in my life) but no go. One very odd thing that was noticed earlier is after a restart, once in awhile, the BIOS would start a very slow memory test. I would just shut it off and it would then do a fast mem test (normal POST). This may or may not be related. Will update this but some general suggestions as to problem may help Unfortunately I have to start w/ a generic question and no hardware specifics.