HP G62 - No Boot

Hi,

Having a problem with a friends laptop and I wondered if you guys could help.

The laptop originally had a fault where the screen would have a blue hue. I took it apart and diagnosed the screen cable as being faulty (reseat the cable and hold it at the right angle and it goes away). I put the laptop to one side and ordered a new cable.

The cable arrived last week, turned on the machine and now it doesn't boot. No display (either on the screen, or when connected to an external monitor), not even the POST stuff. Fan comes on at full speed, then slows down. Caps lock key illuminates as normal but does not flash or anything. After maybe 10 mins it just shuts off.

The laptop is currently largely disasambled on my desk.

I've tried a CMOS reset, and removing the memory (which gave me a flashing Caps Lock light but nothing else). Any ideas?

I suspect the laptop has been dropped at some point as the casing is showing cracks. I've also noticed when connected to the mains a faint "clicking" can be heard coming from the motherboard. Sometimes.


Laptop is an HP G62-a28SA (specs here - HP G62-a28SA Notebook PC Product Specifications | HP® Support... )

 

I very much doubt the screen cable was ever faulty. Virtually every single AMD Based HP laptop will have this fault at some point - the AMD chipset it is paired with has precisely the same fault that the nVidia ones had in the DV series from some years ago. The cooling system is terrible the processor generates to much heat so the BGA solder on the chipset becomes loose resulting in odd screen colours eventually resulting in no display. The chipset needs to be reballed or reflowed and then a copper shim needs to be placed onto the chipset to keep it cooler in future - that blue/green stuff they use is totally inadequate.