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When I go on vacation, I unplug my computers.

The time before last when I got back, one machine wouldn't boot. After a couple of days I got around to trying to fix it, but it was fine.

I just got back from vacation again, and again it wouldn't boot. Based on what happened the first time, I just left it plugged in and kept trying it. After 1 1/2 days it started up normally.

FWIW it's an old Elonex Exentia: http://www.theregister.co.uk/2003/11/26/elonex_exentia_media_center_pc/

Any obvious causes and remedies?

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up vote 1 down vote accepted

The most likely cause of things like this is a bad/faulty power supply unit, however, as your machine uses non standard parts, you may have problems trying to find a replacement.

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Capacitors going, perhaps? Definitely sounds like a hardware issue. – Michael Todd Jan 13 '10 at 4:11

I cant's say this is a solution, but I have had weird experience with my old computer. After I replace the little battery everything is back to normal

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You mean the CMOS battery. – Richard Jan 13 '10 at 10:23
    
yup I think so (well I don't know what it's called) – phunehehe Jan 13 '10 at 16:00

I'm not sure if this is the answer , but I did have a monitor which had bad capacitors .This particular monitor took maybe 1 day to start . Maybe your PSU's caps don't hold (enough)power and need a long time to get enough power to start ?

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