Laptop not turning on and caps lock is blinking once after every 2/3 seconds.

[Cnd7]

My laptop is not turning on and caps lock is blinking once after every 2/3 seconds.I treied to rest BIOS but it couldn’t and I also changed the battery but it didn’t help and i am afraid that if i hard reset laptop it may erase my data(photos,documents,etc.). What should i do next?

[Lil_Boy_Blue]

Hi
Depending on the age of the PC and the BIOS vendor...
https://support.hp.com/us-en/document/bph07107

PLEASE POST ANY RESULTS.
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; Re-Connect the AC adapter.

NOW begin checking/testing/proving the Hardware is fit for purpose.
Power on your PC, press ESC (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).

[Cnd7]

I did the same as you told but nothing happened. Same caps lock blinking and black screen. 

[Lil_Boy_Blue]

Hi

https://support.hp.com/gb-en/product/hp-15-ay500-notebook-pc-series/12229013/model/14689077

https://support.hp.com/gb-en/product/hp-15-ay500-notebook-pc-series/12229013/model/14689077/document...

Unfortunately what you describe could be this....

Caps/Num Lock LED

LED blinks once.  --   CPU  --   CPU not functional

1. Re-seat the processor. NB:- See the Services Media Library for steps for your PC.

2. Replace the processor. NB:- See the Services Media Library for steps for your PC.

3. If the CPU still does not function properly, replace the Main-Board.

[Cnd7]

Will replacement of motherboard erase my data which is saved/stored in laptop(like photos,  , etc.)? 

[Lil_Boy_Blue]

Hi

No reason why it should.  The existing HDD can be remounted and will still work.

The cost of the work may be prohibitive, and you choose to salvage the HDD and mount it externally in a caddy and retrieve your personal data that way.

https://support.hp.com/gb-en/product/hp-15-ay500-notebook-pc-series/12229013/model/14689077/manuals

[Cnd7]

I am very thankful to you for this information.

One more question i have-What is the reason for this disfunctioning of CPU(as i rarely used my laptop and it is in new condition even now)?

[Lil_Boy_Blue]

Hi

It maybe something on the Main Board that supports the CPU,

IE:-      I don't have a clue.