What electrical problems cause my Gateway laptop not to turn on

[cadz4u2c]

It's an old laptop I haven't used in a while and I want to turn it on and it won't what are the possible problems?

 

[richiestang_78]

Try and take out the battery and start it plugged din.

 

[zoltan.boese]

If it does nothing when pressing the power button (no screen, no status LED, no fans spinning) you probably have no power. So check the battery. Try to borrow a multimeter and measure voltage.