hp probook 4420s does not start and continuously cap lock blinks

[Douglasbaskey]

I have tried-------

1. Bios Recovery ( used windows key and B and power button)

2.  changed the memory to another slot

3. Power button holding 3 times (15-20 sec) without connect AC & DC

Still remain the same problem:
Computer does not start and contineously blinking the cap lock

Note: Using Windows 7, when I updated then suddenly shut down the computer and does not start.

[erico]

Try a hard reset as follows:

1) Remove the battery and unplug the DC power adapter.
2) Press and hold the power button for more than fifteen seconds.
3) Plug in the DC power adapter (leave the battery out for now)
4) Press the power button

Please post your positive or negative results here in your thread.

Your notebook does not have Windows 8 installed, but almost everything in this troubleshooting document applies. Take a look at the blinking leds section. Blink codes are a diagnostic aid and the sequence of blinks repeat. There is a list which will tell you what the repeating blinks mean.

[xnanitox]

sometimes the solution is very simple, as reinstall the OS...try to boot from DVD or USB and install Windows again.

i had that problem before and i did everything except the Reinstall OS, which it was very simple and is working ok.

also i had the blinking Caps Lock key...maybe this could work for you.

[Douglasbaskey]

Thanks for reply.

I have reinstalled windows and still its same. Black screen, cap locks contineously blinks and there is no beep or other sound.

I am waiting for appropiate solution.....

[Douglasbaskey]

Thanks for reply.
I have tried your above suggestion. its didn't work. Still its remain same problem.
There is no pause of blinks, continuously cap lock is blinking....

[erico]

Have you counted the blinks to determine which hardware component has failed as I asked in my last post? 

That was the reason that I included the link to the blink code document.

Continuous blinks indicates that the power adapter has an issue

[Wahid2411]

I have same problem.......pls anyone help me........

[Wahid2411]

When I install windows 8.1 on my hp probook 4420s....my laptop have same problm....