My dvd player wont respond,or moniter,mouse,or keyboard !!!!

[lifter46710]

I am currently trying to fix my old computer I sold a month ago !! I have a hunch the guy messed with something he should not have !! The moniter turns on but dont respond to computer, the dvd player is not responding at all,the mouse and keyboard arent responding (both USB)! The computer has 2gig ram and duo processer !! I hear no beeps !! If someone can give me a clue or a hint of what this is let me know !! Also I run Windows XP pro !! I had this computer  about a year and had no problems except a couple of months ago I changed the power supply box !!!!!!!!!!!!!!!!!

[Dias de verano]

You only need one of these at the end of a sentence ("!") Not every sentence needs one. A period is the usual way to end a sentence.

Do hdds, fans etc spin up? Check all wiring. Try changing power supply. If the guy is claiming it just went wrong, and he did nothing to it, is he asking for his money back?

[lifter46710]

The fans run ! And no he will not get his money back ! Hes had it over a month ! I had no problems with it before ! The wiring looks fine ! I don't have any spare power supply but when my last one went out it didn't do this !

[patio]

If you sold it to him and it was running at the time then why is it up to you to fix it ? ?
Who knows what he's done to it...