I have HP desktop, I haven't use it for a while a week a go I restored it like new. Yesterday whenever I start it it shutdown I tried f11 to restore it again but it shuts down I see I quick message it says ; something like "c shutdown due to fan preventing CPU demage" I am not sure because it was so quick. So a was thinking that the fan of the CPU not cooling because of the dirt, I opened it it was durty I removed the fan cleaned it with air dust blower and put it back, in the mean time when I removed the fan I was curiouse to see the CPU I removed it take a look at it and put it back with out damaging a thing. So I put the cables back when I plug the power cord it turn on the system but nothing on the screen and with an orange power led like it is in sleep more tried to turn it off but it doesn't I had to remove the power cord and tried again ply the cord and the pc turns on the fans are all on working but nothing elese. Please what should I do? If you need more info reply to me thanks