Pavilion dv6-3040sa, black screen, flashing caps lock

Hey all, In need of some help for a friend, her laptop has had this issue for a while now and only just come to me for help. Her HP Pavilion DV6-3040SA has an odd issue with it, if you power it up the display doesn't come on and the caps lock just flashes, it will continue to flash until the laptop is turned off. On the help section a flashing caps lock does not refer to any particular error. I've reseated RAM, tried hard resetting, reseated the CPU and it managed to power up, then after it was turned off, it wouldn't power up again and had the same issue, after playing with it some more it powered up and worked for 2 days, when it promptly stopped working again. Any reason for this issue? 

Processor failures can be have inconsistently.  I have seen processor failures start with 1-2 second hangs in the OS to working one day and not at all the next. 
The blinking code you have desribed is a beep code of one.  Review the following table found here.
Caps Lock/Num Lock
1
CPU
CPU not functional
Reseat replace CPU.
Service
Caps Lock/Num Lock
2
BIOS
BIOS corruption failure
Restore BIOS from onboard backup (jumpers)
Service
Caps Lock/Num Lock
3
Memory
Memory module error not functional
Reseat memory modules (see next section).
Test memory from UEFI or BIOS.
Replace bad memory modules.
Service
Caps Lock/Num Lock
4
Graphics
Graphics controller not functional
Service
Caps Lock/Num Lock
5
System board
General system board failure
Service
Caps Lock/Num Lock
6
BIOS
BIOS authentication failure
Restore BIOS from onboard backup (jumpers)
Service
The options for a blink code of 1 is to reseat the CPU as you have already done or to replace the processor.  Since the issue returns after reseating the CPU, it looks like the CPU needs to be replaced.  Sorry. 
 

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