Overheat problem shut down

My Asus after initial problems (other than heat) four years ago when bought has been great until past few days when it shut down as it got quite hot and it shut down again today.

Is it just the fan needs replacing?

I opened it today to see if any dust and amazingly only a millimetre of dust was on the plastic fan after four years very heavy 9 hour day use.

Please help what coudl be the overheat problem
Thanks

 

First - is the fan actually running?

Second - dust on the fan itself is mostly irrelevant ... be sure the radiator fins at the exhaust vent are clean from the inside.

 

Yes it is running
YEs I cleaned it carefully today

Thing is if it keeps doing it and I have to keep doig safe mode recovery sooner or later a spark will happen across the disk and data will be corrupted

 

Could you tell me that I rolled back my laptop as this graphics problem arose and now its still overheating as I took out the fan cleaned it again but it looks clean inside and the vents

so why is it overheating? Is it that I ned a CPU fan or that I also have to do something with the graphics card or driver but the driver is apparently up to date. ALso is there also a GPU fan?

As Windows said Nvidea driver problem or something and now I cannot use Windows Movie Maker as it said there is some graphics problem and I have to shut down my laptop after 40 minutes each time

THanks

 

The video card I have is an Nvidea GeForce 9300M G

 

If it's still shutting down all the way, then another potential culprit is thermal paste failure or a crack somewhere in the heatsink so that it isn't conducting heat effectively.

 

I had same issue with U6V 9300M G GPU and laptop shuts down every few hours due to overheating.

The problem was CPU overheating not GPU, I replaced the fan and problem solved.