I have a Dell Inspiron N5010, when I turn it on, the laptop runs for only 2 minutes and I already checked the fan works and it's clean. I do not know why the PC automatically shuts down if someone knows why?, if someone know I will thankfully.
Is the system running hot? If it is, a thorough cleanout inside and replacing the thermal pads that sit between the heatsink and CPU/GPU heat slugs should ease the problem.
If it's not, it's most likely a mainboard going bad.