A friend of mine asked me to look at his laptop. It would over heat and shut down after thirty minutes. When I looked at it someone had already opened it up. The inside was a mess of dust crammed in the fan intake, crumbs, and crust from maybe a liquid spill. I cleaned it up, put it back together andf all I get is lights on the cap locks and number lock keys flashing. It is a HP Pavilion g7. It has no sounds of life except the lights flashing. Should I tell him to buy a new laptop?