When that fan starts spinning faster and louder

It's time to go and check whether the heatsink is filling up with fluff. Clearly the cooling is not working properly.
Sadly my Laptop was doing this. I was not at home, travelling and then came to work and was sick for 3 days. Finally, last night, the primary graphics card on my Laptop failed with an ominous repeat of 8 very loud beeping noises.
Tonight I stripped the thing down and found the CPU and primary graphics card (didn't know it at the time), heatsink vents were more than 80% blocked with fluff. It's not the first time I've hovered them out, but I don't have a hoover here and I was mainly in bed sick.
So now my machine is running on the Intel integrated graphics until I decide to take the thing apart again and swap the secondary graphics card over.
What a pain. But it's always a good yardstick. If your PC is normally quiet and it is becoming more and more noisy, it's time to go in and have a look...
Sadly my Laptop was doing this. I was not at home, travelling and then came to work and was sick for 3 days. Finally, last night, the primary graphics card on my Laptop failed with an ominous repeat of 8 very loud beeping noises.
Tonight I stripped the thing down and found the CPU and primary graphics card (didn't know it at the time), heatsink vents were more than 80% blocked with fluff. It's not the first time I've hovered them out, but I don't have a hoover here and I was mainly in bed sick.
So now my machine is running on the Intel integrated graphics until I decide to take the thing apart again and swap the secondary graphics card over.
What a pain. But it's always a good yardstick. If your PC is normally quiet and it is becoming more and more noisy, it's time to go in and have a look...