Laptop suddenly shuts down

My Fujitsu laptop shuts down after 1-2 minutes of operation and it won't turn on after that for about 10 minutes.

Though it may seem as an overheating problem l recently cleaned the fan and the heatsink.

So l would like to hear your suggestions on that matter.

It sounds like overheating to me.

Get into the BIOS and look for a monitor/status tab and check out the temps.