Power is ON, screen is blank, all fans are running

[Tan23]

Hello everyone,
I have a computer problem. My computer power is ON but screen is blank.

1.CPU power button light is ON
2.All fans are running
3.Keyboard and mouse just power is ON
4.Power supply input cable replaced n tested
5. Supply output cable seems good, power is flowing input to motherboard to CPU fan.
6.Tested removing Graphic card
7.RAM is also replaced n tested
8.Tested removing DVD rom
9.Monitor tested on other pc (working)
10. Inserted windows DVD to boot, not successful.

Still there is no display , nothing at all. Windows DVD also not able to boot or display anything on screen.
I reviewed some privious posts, not successful yet.
Please help to resolve the issue. Is there something good way to troubleshoot?

Thanks

 

[user11464]

system specs?

 

[Tan23]

Previously It was running fine since last year. Error began with Microsoft updates, displayed blue screen since last week, displayed white screen twice this week only, displayed some bad color lines once this week, Restarted randomly since last week. Sometimes it got frozen randomly since last week or more.
I reinstalled OS yesterday. It was fine. After couple of hours it repeated some of errors mentioned above. Then it got blank screen and did not wakeup yet.

SO Far I can write the following specs

ASROCK 960GM VGS3 FX, DDR3 1866 XFAST RAM 8GB
AMD FX (TM) 4300 QUAD CORE 3.8GHZ
POWER SUPPLY CELL660GT with fan
NVIDIA GEFORCE GT740 with fan
1 exhaust fan
1 CPU fan,

Motherboard LAYOUT
http://www.asrock.com/mb/AMD/960GM-VGS3%20FX/

Motherboard specs
http://www.asrock.com/mb/AMD/960GM-VGS3%20FX/?cat=Specifications

Graphic card
https://www.google.co.kr/search?q=CELL+660+GTX+power+supply&client=ms-android-skt-kr&biw=360&bih=559&prmd=ivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiY7pn_qLzSAhXDqJQKHcy4BjMQ_AUIBygB&dpr=2#tbm=isch&q=geforce+gt+740&*&imgrc=F8yrmqYcifeSvM:

 

[Gagan sarpanch]

i think you need to replug Your Psu Cable to motherboard

 

[Tan23]

Dear Gagan sarpanch, I replugged and checked almost every cable, RAM. Unfortunately, it is still not responding.