Beverly Woods wrote: > Hi folks, > > I have here an Intel iMac (20", early 2006) that appeared to be > working normally, except that reportedly sometimes it took a long while > of black screen to wake from sleep. I attempted to upgrade the RAM from > 512 to 2G (known good RAM that works fine in another of the same > machine). After I did that it would not power on at all - no light, no > noise, nothing. I went back to the original RAM, it still would not > power on until a lot of unplugged time had passed, and now it starts or > won't start intermittently: if it starts normally it seems happy to > restart after that, but once it won't start it seems to want to be left > unplugged for a while or it won't start later. Also if I do anything > with the RAM (try to add another chip, move the existing chip to a > different slot, etc.) it won't start for quite a while after that. The > 512 appears to be recognized in either slot, once I get the iMac started > up, but so far I haven't had any luck booting it after installing a > second chip - but of course as with all intermittent issues I am not > certain if it might at some point. > > So, my question before I go about replacing the power supply: is > there anything that could cause this issue besides a faulty power > supply, especially any type of logic board failure that could cause > this? (It looks to me like it would be worth replacing the power supply, > but if there is a problem with the logic board that probably would not > be worth replacing.) > > TIA, > > Beverly > > - Long shot but maybe pram battery.
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