Reset the bios and it boots but then locks up at login screen. It displays random error messages when booting. Failure to find SATA HDD, Floppy diskette etc. Got a techy friend to take a look at it and he agreed with me that the motherboard was fried. Aparently it is extremely common on this model. So new PC it is. I will not let my dad pay $500 for a proprietary motherboard on a rubbish pc. Dell can go and stick it where the sun don't shine.