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I bought a pc of ebay but when I power it on it comes to the desktop page and the start button doesnt work but the desktop icons do but if I was to double click on then the pc would just freeze. If I turn on the pc and just leave it sitting for 30 minutes 7 out of 10 timed the start button will work but desktop icons dont and I can do a few things like explorer ect but most the time it will just freeze. I spoke to the person I bought it from whosaid to reseat the memory and processor but that hasnt help. Would anyone here know what could be the problem