Pc is on but nothing is displayed on screen

DarknessGhost90

Prominent
Jun 4, 2017
3
0
510
When I turn on my pc nothing shows on screen.My pc is old it was working fine until I removed it for a couple of days then placed it back. I am sure the pc is on, I opened the case the fans were working I could hear the HDD running.
Things I have TRIED :
1.Swapping monitors and VGA cables
2.Swapping the PSU
3.Removing the CMOS and placing it back (resetting the bios)
4.I have 2 sticks of RAM I tried testing each of them at once still same problem
4.Disconnecting the HDD
5.Re-seating the GPU

I heard on other forums that there is a chance to fix this error by reseating all the pc parts is it worth the time?

PC SPECS :
Motherboard : ASRock G41C-VS
CPU : Core 2 Duo E7400 or E7500
RAM : 2 sticks 2GB each DDR3
HDD : WD 500GB
PSU : Huntykey 350W
PSU 2 : Goldenkey 500W
GPU : ATI Radeon HD 5450

The pc was working fine.