Help plz... my HP pavilion first started making a wierd buzzing noise after i tried doing disk clean that failed in the middle. When i came back to my computer, it had a black screen, and then started making the buzzing noise after i restarted it. Then when that persisted, i backed up my files on an external hard drive and wiped out the hard drive in the pc. then i tried reinstalling windows vista and it failed in the middle of that, froze up and the monitor looked like it was freaking out by going to a blue fuzzy screen and going black again. now screen keeps going into power saving mode and i need help plz.