Won't boot up but fan keeps going
Hi. My iMac G5's been ultra reliable but just froze today then wouldn't allow me to do anything at all - fan started being really loud as well. So I turned off and now when I hit the power on button, it won't boot up at all, just a blank screen and then, if I wait a couple of minutes, the fan turns on full blast. Any clues? I'm not getting as far as the apple logo even...
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Thanks for comments. The fan spins at high speed until you switch off - and you can use the normal on/off switch for this. I have taken the back off and looked at the LED diagnostic lights. LEDs 1 and 2 come on as they should but LED 3 remains completely unlit. The capacitors don't seem to be leaking or bulging - I've looked at the sample pics on the web and it might not be this(??). The Apple support guides are of limited use as the symptoms aren't exactly the same as any of their scenarios. Any other sugegstions gratefully received. Thanks
by glyn