Flushing lights and black screen

[Rjwidmaier33]

My computer won’t boot.  The Caps lock and Number lock light flashes and the screen is black.

[Lil_Boy_Blue]

Hi

A simple 3 blinks could be...

LED blinks 3 times

Memory

RAM Module failure.

1 Reseat the memory. NB:- See the Services Media Library for steps for your PC. 2 Check each individual memory module and swap slots. 3 Replace the memory modules causing three blinks or if the blinks follow the slots. 4 Replace the Main-Board.

3	MEMORY READ OR WRITE FAILURE

Caps/num lock lights = 3 blinks - Memory module error.

So consider this....
First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

Power on your PC, press Esc (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).
AND/OR
HOW DO I USE DIAGNOSTICS?

HP PC Hardware Diagnostics Windows is a Windows-based utility that allows you to run diagnostic tests to determine if the computer hardware is functioning properly. The tool runs within the Windows operating system in order to diagnose hardware failures. HP PC Hardware Diagnostics Windows comes pre-installed on new HP computers, but if not on yours, download here:

http://ftp.hp.com/pub/softpaq/sp93001-93500/sp93457.exe