I strongly suspect that there's a problem with your motherboard. In that case that could cause all the odd behavior you've been having. Since you said that reverting to default settings made it work a few times reset the BIOS by changing the jumper (you have to put off the comp before doing that) . You can find out which jumper and the instructions in your motherboard manual. To find out your motherboard model in XP use the PCWizard or CPU-Z program(and post it here if you find out). In Ubuntu use the lspci or lshw command and look through the output.If that doesn't work check if there's a BIOS upgrade and install it to see if it helps.
By the way is your Ethernet card an onboard one or a separate card ? And what kind of graphics card do you have ? One lase thing: next time you give your comp for servicing don't give the hard disk since it'll probably have some important data. Also please do me a favour and call the guy who "repaired" your comp and scream and shout at him . He should NOT have touched your data at all.
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