Clear sign of defective GPU/north-chip (g6100/g6150) in this model.
Best option: Chip need to be changed for a new one (08+).
Rework/reball/reflow does not last for long here.
I'm from Germany
Please excuse if my English is not so good or misleading. Trying my best.
solution for this is dissmentel laptop remove mother board remove ram cpu cmos battery
from motherboard look do you have gpu on mother board if gpu present just heat the gpu for 1 minuts by using smd rework station or 30 sec by hot gun assemble the laptop and it start working normal but dont forget to clean cpu fan dust before assembling laptop remove 3 screw of fan unit and cleane by brush or cleaner this problem is occure due to fan vantilation problem as soon as your laptop work after loding windows download new version of bios and re program your laptop bios some time after updating bios problem may not come again
if same problem come again you have to change gpu chip now if possible or replace the mother board hope so this my help you
this solution is applicabel in maximum laptop having gpu problem
Heating GPU with a smd rework station will give you a temporary solution, best way to fix it is reball it nicely or the expensive way ; swap with new one.
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