I recently had a serious overheating problem with my laptop. I tried almost everything. Even a flat ice pack. The fan was working but I could feel no air moving anywhere. Blew air into intake ports and every other place I could see but didn't help. While the fan was running at full power, I used an air can to blow air into fan exhaust. A huge cloud of dust boiled out, the fan sounded more relaxed and no more heat issues!

I tried to fix an overheating problem with my laptop and the only thing that helped was using an air can to blow air into the fans exhaust port while the fan was turning. It blew out a cloud of dust that fogged the room. Blowing air into the intake ports did not help at all. The PC now runs cool and much quieter. The only drawback, I lost my heating pad. Give it a try!

You may just need a new fan but first make sure that vents are clean and allow air in.

Make sure that the fan holes are not blocked and that the cooling fans are actually working. It's sounds like either the CPU fan or the power supply fan have stopped working. These parts are replaceable but you should have the work done by a technician. If it's under warranty then take it in for repair otherwise you will have to pay to fix it. As for buying a new one it would depend on what your willing to pay to fix this one.

if the fans are spinning they aren't broken my step brothers has the same problem I don't know if you can get them but what you need to get is a pad type thing that you can put the laptop on that won't cover the fans and I'm guessing its an old laptop that has been used heaps but if you can sit it without covering the fans it won't overheat or turn off it worked for us but we used cups to hold it put in the air you could try that before you go looking for the pad thats going to hold it in the air if that works then search for the pad if they exist I dunno if they do but thats probly your best bet

or it could be the battery try making that out and if it doesn't do it without the battery then buy a new battery

we worked out with ours the battery was fine the fans were just covered and couldn't work

good luck