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Dell Inspiron 2350 Randomly Rebooting

A client's custom-built computer recently died on him so he decided he wanted to remove the HDD and install it on an older retired system (Dell Dimension 2350). However the drive is a SATA and the old system only had IDE connectors. So I purchased a Bytecc model BT-PCI-SATA150 card. When I installed this adapter card in the Dimension & upraded the BIOS, the PC booted right into Ubuntu Linux and seemed to be working just fine.

However, client is now reporting that computer randomly reboots. There doesn't seem to be any pattern to this rebooting.
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JAN PAKULA
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Add another vote for the power supply.
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Hadn't thought of flakey power supply being the cause of this. Do SATA drives require more power than IDE drives? Actually don't have original IDE HDD to test w/ b/c it died a while back.

I don't believe this is an overheating issue b/c when it reboots, the user can then continue to use it for up to 2 hours before it reboots again. If this was an overheating problem, then it would be rebooting much more regularly, no?
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It's not the memory or overheating, this is not a normal symptom for either of these.

Most often it's the power supply. So another vote for the PSU.
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OK. Thanks Guys. Well, that's an easy thing to try. Assuming the power supply from his custom-built PC  is the same form factor, I should just be able to pull that one out and install it into the Dell Dimension to test this hypothesis out. Hopefully I can get out to this client on Tuesday.
That's a valid point, tkidwell447. I was also thinking of doing a complete wipe & reinstall of Ubuntu Linux which would ensure that all the Linux hardware detection would take place and the optimum drivers would be loaded for every hardware component. However, that's a fairly time-intensive project, so I think I will try swapping the power supply first. Thanks.
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not sure, but did linux load drivers for the new pc devices??  that can be the cause
I don't know if it did or not. I'm not very familiar with Ubuntu, so I don't know if it dynamically checks whether the drivers match the hardware or if this is only done in the initial installation?
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I'm sorry to say that I put in another power supply today and the lockups/reboots are still happening.

I'm starting to think this may be an issue w/ the RAM. Gonna try swapping in new RAM.
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Good idea Nobus.
Running off the Live CD seemed to work well enough. But then installing both Ubuntu 9.10 & 10.10 failed, so it does seem like there is a HW problem here. Mostly likely the HDD since that is the one component irrelevant to the live CD.

Going to either replace the HDD or just buy a whole new system unit.
note that it can be the disk controller (on mobo) too..
did you try to exercise the disk from the live cd?  try copy/paste
and to be sure about the disk -  run diag on it - all are found on ubcd  : http://www.ultimatebootcd.com/      
Specifically which disk diagnostic program on UBCD?
the one for your disk brand
Sorry for the long absence. In the end client found a very good deal on a 2nd-hand HP computer so we just gave up on the Inspiron 2350. I will close out now.