Hp dv4-2112tu no boot no display , ram and hard disk are ok and checked, shows caps num led blinking

Hello Sir/Madam,
I have HP DV4-2112TU
My laptop doesn’t boot completely and shows blank black display. CPU fan running normally and hard disk rotating normally.
Battery charging is ok and charging-power led glows normally. Caps lock and Num lock led flashes 3 times and then wait for one second and then flash again and so on. Laptop is stucked in booting process.
I have checked both of my RAMs and Hard Disk in Another Laptop. All are working fine and shows no issues.
I have also checked my laptop installing new RAM in both ports (simultaneously) and a new Hard Disk but Laptop shows same problem - no display no boot.
I showed my laptop at an authorised HP Service Centre... they told me that the problem is related to my Hard Disk....But this is wrong Because a faulty hard disk is never cause no display and no boot and even no BIOS POST message. They told me wrong cause of fault because I have checked Hard Disk and it is OK.
Can anyone tell me what are the issues related to my Laptop..... …..
Thanks in advance.
This question was solved.
View Solution.

Hi,
The 3 blink pattern does correspond to issues with the memory modules, see the document below:
Computer Does Not Start and Emits an LED or Beep Code
Since it sounds like you've done everything possible to eliminate the memory modules themselves as the source of the problem. Based on your description, I'd agree that the problem is probably not the Hard Drive. Which unfortunately leaves us with a problem with the Motherboard as the only component that might be implicated and that hasn't been changed out yet. It could be as simple as a bad connector, or something less easy to detect in the logic on the board, but either way, it seems like it would need to go back to a service center for repair.
R
Although I am an HP Employee, I am speaking for myself and not for HP.

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