Compaq Presario CQ56, Caps Lock Blinks

I have a Compaq Presairo CQ56-115DX.
I turned it on one day and the caps lock key's led blinks, at 3 second intervals. (Never stops, waited 4 or 5 hours)
I have looked at the page on HP support, I have tried hard reset, reseatingk, and replacing the CPU.
Still an issue.
When I hard reset, I've tried with and without wifi, hdd and ram installed.

Here is a document on the Blinking lights -
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01443366&cc=us&dlc=en&lc=en
they contain a code:
The LED lights near the Caps Lock and Num Lock keys will blink if an error is detected during the start up process. The LEDs will blink a number of times in a sequence and then stop. The number of blinks in the sequence indicates what component caused an error when it was being tested during start up.
If the LEDs stop blinking and the computer does not start, you can press the power button again to repeat the tests. Count the number of blinks, and use the chart to identify the error condition.
Knowing the number of blinks is helpful when you contact an HP support agent for technical help.
Caps Lock/Num Lock LED Component Tested Error Condition
LEDs blink 1 time
CPU
CPU not functional
LEDs blink 2 times
BIOS
BIOS corruption failure
LEDs blink 3 times
Memory
Module error not functional
LEDs blink 4 times
Graphics
Graphics controller not functional
LEDs blink 5 times
System board
General system board failure
LEDs blink 6 times
BIOS
BIOS authentication failure
I am an HP employee.
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