HP pavilion was plugged in and on then screen flashed and went black now it doesn’t boot up

[MsMoJo]

My pavilion laptop screen went black and it won’t come on

[BeemerBiker]

Try a hard reset

• Turn on the computer by holding the power button down for 20 full seconds then release.
• Press the Power button one more time (if necessary) to start the computer.
• Tap the ESC key about once a second after you see the LEDs on the keyboard flash.
• Press F2 to run diagnostics: (v) 2.6.1.0 or later.

Let me know what happens

[MsMoJo]

I tried what u suggested and nothing happened. I know the fan comes on when I press the power button. I have removed the battery just using plug in.

[BeemerBiker]

Disassemble, remove memory, use air duster to clean motherboard. Clean memory sticks.  Put memory back in one a a time and test using that hard reset.