Old rig not booting without GPU

[Vyrnac]

Disclaimer: I have been working with PCs for many years now and have solved many issues by myself over the years until I faced this problem 

 

Youtube demo:

 

UserBenchmark link

OS: Windows 10 64bit
CPU: Intel Core i3-2100 - 61.3%
RAM: Kingston 99U5471-056.A00LF 99U5471-011.A01LF 10GB - 34.7%
MBD: Asus P8H61-M LE/USB3

PSU: Gigabyte 550W

Finally got a new awesome rig and moved my current 660TI card to the new rig. Right after that, the old rig always restarts while trying to boot into everything (windows 7,8,10, recovery media like cd and pendrive). It happens when it's booting into the OS or media I connected (a few seconds after, the boot from sd card phase). I confirmed that this is NOT related to my hard disk or my OS like drivers as it still happens even after I disconnected all the HDD.

 

As soon as I plug a GPU into it, everything just works. It sounds like a bad joke but my old rig just misses having a GPU connected to it? Will add screenshots and video soon when I can

 

What I've tried:
Isolating individually all other parts like RAM, Hard disk, OS (drivers)
Tweaking every settings in the BIOS including graphics settings like force set iGPU as main graphics adapater

Updating to the latest BIOS
Resetting BIOS by doing it in BIOS menu and force reset by taking out CMOS
Inspecting the actual motherboard and found no issues

 

What I think I have to do:
Get a new cheap mobo since I plan to use this old rig as a server

[IanDrexP]

Maybe the video-out port you are using is not working anymore? Try using the other if it works. If it still doesn't, try to plug in speakers or headphones and listen if it makes it to the windows desktop even without a display. If it does then it definitely is either the iGPU or motherboard video-out ports causing the problem. 

[Vyrnac]

On 5/10/2016 at 3:08 PM, IanDrexP said:

Maybe the video-out port you are using is not working anymore? Try using the other if it works. If it still doesn't, try to plug in speakers or headphones and listen if it makes it to the windows desktop even without a display. If it does then it definitely is either the iGPU or motherboard video-out ports causing the problem. 

It doesn't, still continuously reboots after I turn it on. There was someone that had a similar issue but couldn't solve it as well. I'm guessing the graphics controller on my mobo pretty much got screwed and somehow would not fallback to the iGPU even though I forced it via the settings

[0x1e]

8 hours ago, Vyrnac said:

It doesn't, still continuously reboots after I turn it on. There was someone that had a similar issue but couldn't solve it as well. I'm guessing the graphics controller on my mobo pretty much got screwed and somehow would not fallback to the iGPU even though I forced it via the settings

This may be a Windows problem.

Have you uninstalled the GPU drivers using DDU in safe mode?

Then installed the iGPU drivers?

[Vyrnac]

11 hours ago, 0x1e said:

This may be a Windows problem.

Have you uninstalled the GPU drivers using DDU in safe mode?

Then installed the iGPU drivers?

I'm very sure this is not an OS or driver issue as it still happens even when I try to boot into a recovery or new installation OS media after removing all the existing HDD

[Vyrnac]

Issue resolved! Full credits to the guy here:

http://www.tomshardware.com/forum/314208-30-wont-boot-windows-intel-graphics#10737012

 

I had to disable C3, C6, AND C1E state under CPU power settings. Still don't know the exact cause but it all works now. Thanks anyway to everyone who replied

 

 

[IanDrexP]

On 5/12/2016 at 7:17 PM, Vyrnac said:

Issue resolved! Full credits to the guy here:

http://www.tomshardware.com/forum/314208-30-wont-boot-windows-intel-graphics#10737012

 

I had to disable C3, C6, AND C1E state under CPU power settings. Still don't know the exact cause but it all works now. Thanks anyway to everyone who replied

 

 

So your PSU isn't capable of those power states then... Weird BUT IM GLAD THAT EVERYTHING IS OKAY NOW!