computer turns self on and off

T

the tree

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Hi I have a Dell dimension 5000 (Dimension 5000 P4 processor 520 with HT technology 2.80GHz, 800fsb, 1MB cache, 512MB DDR400 Dual Channel Memory (2x256), 80 GB Serial ATA Hard Drive) which is turning itself on and off.

This problem orignated when it was within warrenty so after a number of tech support calls it went back to dell where they replaced the PSU, the memory and the filler unit. It still didn't work. Went back to dell again and they replaced the motherboard. This seemed to solve the problem but now a couple of months later (and out of warrenty) it is doing it again. It started off just turning itself on once in a while. Now it is turning on and off repeatedly, sometimes just on for a few seconds, sometimes booting into windows. It stayed on for a couple of hours yesterday and everything was working fine, then when I turned it off it immediately turned back on again and off again etc til I unplugged it. It is on a Belkin surge protector, but the problem is there when on a different socket too. It has been but is not now connected to the internet and it has up-to-date virus protection (Sophos)

Any ideas.... Should I try a new motherboard? don't want to have to be buying new motherboards every couple of months though......

Please help!
 
I would say if the motherboard they supplied as a replacement to you is only a couple of months old, you are within the standard 1 year warranty period for the motherboard, which you believe is the problem. If it is defective, regardless of the warranty of the whole system, they should replace it.

If they've replaced the PSU to no avail, and you managed to get 2 good months out of the thing when you replaced the motherboard, i'd be inclined to think it was yet another dodgy motherboard.

I would try and get someone physically coming out to you. And watch them test every component on-site. Apart from that I'm not sure what else to suggest.
 
does your nic have wake on lan options and are you running any kind of UPS software while connected to a UPS?
 
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