GPU no longer recognised

[skittleZ92]

Hey everyone, so I'm hoping it's not dead after having the laptop for 6 years, but randomly while working

 

[popatim]

I would disassemble, clean, reapply thermal paste to both coolers, clean contacts on gpu and ram... general maintenance work 🙂
This is probably not a job for a novice, disassembling the r4 is rather more involved, so you may want to research your area for a qualified shop that offers warranty on their work and has a good reputation.