Help! M18x R2 - Dual 7970m freezing Windows 7 at boot

Questor

New Member
Jul 26, 2013
3
0
UAE
Weathered pc tech here reaching the end of my tether..

3 months ago bought M18x R2. No problems until..

Few days ago, connected to TV via HDMI 1920x1080 res, discrete gfx mode, lid closed video output to hdmi only..
Screen image shredded / distorted horizontally.
Hdmi cable out. Machine shutdown.
Restarted with lid up, displayed bios and windows logo but then hangs..

TRIED:

Safe mode - discrete gfx - works (so i figure corrupt drivers)
Uninstall catalyst and amd drivers, redownload fresh set, install, same issue..

Switched to on board intel HD4000 mode
Boots into windows no problem...

So am thinking.. Graphics cards / drivers..

Swapped discrete cards over in their mb slots, cleaned fans / applied fresh heatsink
Installed fresh Win7
All okay until i instal catalyst driver for discrete.

So i am thinking... Positive.. Driver issue..

BUT... Then yesterday... It worked... I was stunned.. Why?!?
By accident, my wife disconnected the plug from the wall.
so i booted the machine up on battery power only, discrete gfx mode and it goes straight in to windows...

Now i am thinking, this cannot be a driver issue, at least not the amd catalyst driver.
Tried with a completely different HDD and fresh install of Win7 and still no luck.

Has anyone ever seen this before?

Summary:
Battery in / Mains Power:
OnBoardGFX - loads windows okay
DiscreteGFX - windows hangs

Battery out / Mains Power:
OnBoardGFX - loads windows okay
DiscreteGFX - windows hangs

Battery In Only
OnBoardGFX - loads windows okay
DiscreteGFX - loads windows okay
Can plug mains power in after boot with no problems.

Thanks
 

MattyB

Moderator
Mar 19, 2012
3,110
126
Adelaide, Australia
It's a long shot but maybe try clearing your CMOS. Anything is worth a try. Remove your battery. Hold the power button down for 20-30 secs. Remove the CMOS battery. Bridge the two pins on the CMOS battery connector coming from your mobo then put everything back together.
You never know. It could work.
 

Questor

New Member
Jul 26, 2013
3
0
UAE
It's a long shot but maybe try clearing your CMOS. Anything is worth a try. Remove your battery. Hold the power button down for 20-30 secs. Remove the CMOS battery. Bridge the two pins on the CMOS battery connector coming from your mobo then put everything back together.
You never know. It could work.

Thanks MattyB

Tried resetting BIOS as instructed above.
Am considering flashing back from A11 to A10

Spoke with Dell, they think it is a PSU port on the MB issue.
Waiting for change of ownership to be able to use warranty.
In the meantime, I have a workaround.

Cheers for the reply though. Always appreciated :)