Okay, after looking at your last post,
I wan to ask, is there any small LED that lights up on the motherboard? Near the CPU, the memory or the SATA ports or the PCIe slots?
After checking out the LED situation, I think it's time to breadboard.
Take out every single thing out of your computer case. (I mean everything).
Now put your mobo (with cpu and heat sink still attached to it) onto the motherboard box (the box that came with your motherboard (if you don't have a motherboard case, find a cardboard, or a wooden table if you don't care about scratches on it.
Plug in the power (24 pin and the 8 pin cpu power). Also the HDMI cable onto the mobo. plug in the heatsink fan pins. Put on 1 stick of memory anywhere on the board. Find the two pins for power (where you put the PWR jumpers from the case onto the motherboard). Touch the two pins with the tip of your screwdriver. It should turn the pc on.
Now what happens? Fan turn on? Any LEDs? screen turn on or not?
Also, about the Hard drive failure, it shouldn't mess with your display. Something else is wrong.
In order of likelihood . 1 being the most likely.
1. GPU failure (despite light turns on, card still might be dead).
2. Display cable dead.
3. Mobo dead.
4. Memory dimm stick dead.
Last edited by Darthutos
on Tue Jan 23, 2018 12:38 pm, edited 1 time in total.