Hp pc doesn't display on the monitor and caps lock blinks twice every 3-4 seconds. whats the problem and how can i rectify it?

first of the check the cable connected to your pc and pc via monitor if every thing is is your steps would as follows

check power supply fan(if its running like normal then go to next step)

check rams(if there are more than1 ram then remove all rams and clean its bus(yellowish part)with eraser then check1 by1.)

if its still getting same problem then check your display card with external if its inbuilt then there is a faulty in motherboard.)

do this process as according to step by step i hope you fill find your display

The last thing i did, remove CMOS battery and after a few minutes i plugged it.

Then connect AC power adapter and press power button.Laptop starts but gives a error message

"The CMOS checksum is invalid, The BIOS will be reset to the default configuration and will be rebooted."

Finally laptop start normally. It works fine ...

But same problem when i restart

"blank screen caps lock blink2 times every3/4 sec"

So finally

1. remove CMOS battery and after a few minutes i plugged it again

2. connect AC power adapter and press power button

3. laptops starts normally (with a error msg same as previous)

4. Upgrade bios to F.(previously i had F.)

5. Everythings works fine (restart/shutdown have no effect)

It looks like BIOS corruption failure.