I have just returned from a trip overseas and left my iMac wrapped up in the attic. When I got it down and left it to acclimatise to normal room temperature for 2 days it wouldn't start.
I can hear the chime sound and then the spinning thing comes on and never stops.
The hardware scanning software detected a error: "2STF/8/3:ATA-100 ata-6-master" but only during the first run. Two subsequent scans did not generate any error messages.
Any ideas would be warmly received.
PS: my iBook died during my journey in December 2005: the HD went first and after it was replaced for $300 the logic board gave up one week later.