MOBO will not POST with Monitor plugged in

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   Hi, 

Symptom:
When I press the power button, no beeps, and the fans spin up, but the machine never starts.
TO find the issue, I pulled one peripheral at a time until I discovered that if the monitor is disconnected, it will POST, and beep once (normal) and boot up correctly. 

If I restart from the OS or command line, it will reboot fine. The issue is only on power off/power on situation. 

This started around a year ago, and Yes, I have been leaving the machine on 24/7 unless I will be gone for extended period.

This build is about 6 years old, worked perfectly until about a year ago. To my knowledge, no system changes that would have caused this.

Corsair CX600
AsRock H97M Pro4 
Pentium G3258 @3.2GHz
Corsair Vengeance LP 2X4GB  
No Name RAM 2X2GB (I already removed these for troubleshooting, I have not put them back)
Nvidia Quadro 4000
Kingston SV300 120GB
WD Blue 160 GB
Ubuntu 20.04 LTS 

I know the machine is 6 years old, but it has been great for everything I need.
I was thinking of picking up a used i7-4790K or Xeon to get another year or 2 out of it.   

What other items can I check or test to make sure it's not my Vid Card£ 
Could it be the monitor£

Thanks,

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itsnotbroken Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13 Mar 2021 Location: Hesperia, CA Status: Offline Points: 35	Post Options Post Reply Quote itsnotbroken Report Post Thanks(0) Quote Reply Topic: MOBO will not POST with Monitor plugged in Posted: 13 Mar 2021 at 11:58pm
	Hi, Symptom: When I press the power button, no beeps, and the fans spin up, but the machine never starts. TO find the issue, I pulled one peripheral at a time until I discovered that if the monitor is disconnected, it will POST, and beep once (normal) and boot up correctly. If I restart from the OS or command line, it will reboot fine. The issue is only on power off/power on situation. This started around a year ago, and Yes, I have been leaving the machine on 24/7 unless I will be gone for extended period. This build is about 6 years old, worked perfectly until about a year ago. To my knowledge, no system changes that would have caused this. Corsair CX600 AsRock H97M Pro4 Pentium G3258 @3.2GHz Corsair Vengeance LP 2X4GB No Name RAM 2X2GB (I already removed these for troubleshooting, I have not put them back) Nvidia Quadro 4000 Kingston SV300 120GB WD Blue 160 GB Ubuntu 20.04 LTS I know the machine is 6 years old, but it has been great for everything I need. I was thinking of picking up a used i7-4790K or Xeon to get another year or 2 out of it. What other items can I check or test to make sure it's not my Vid Card£ Could it be the monitor£ Thanks,
	if it's not broken...

itsnotbroken Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13 Mar 2021 Location: Hesperia, CA Status: Offline Points: 35	Post Options Post Reply Quote itsnotbroken Report Post Thanks(0) Quote Reply Posted: 28 Sep 2021 at 12:18pm
	UPDATE. NOTHING WORKS. NO PERIPHERALS PLUGGED IN, FANS SPIN, NO BEEPS I ASSUME THE MOBO IS DEAD. THANKS FOR THE HELP HERE. NO MORE AS ROCK IN MY FUTURE..
	if it's not broken...

The_Nephilim Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 26 Mar 2021 Status: Offline Points: 880	Post Options Post Reply Quote The_Nephilim Report Post Thanks(0) Quote Reply Posted: 28 Sep 2021 at 2:27pm
	I would check the Power supply