Solved Reset BIOS after inserting/removing GPU

September 11, 2013 at 06:01:51
Specs: Windows 7 64bit, 3.4Ghz - 8Gb Ram
My computer would not turn on at all the other day, had been having slight issues with it for a while, mainly powering up but once running it was fine. Thought it might have been a psu failure so I swapped my psu and removed my graphics card. I have a dual boot system, both windows 7, on 2 separate SSD drives. It would not touch my ssd drive with my day to day version of windows 7 on it but would boot to my original install on my original ssd drive.

I then reset my BIOS and tried booting as normal & I could then boot to both copies of windows, restart, shutdown and power up as normal.

I then put my graphics card in and nothing. Power on, fans turn but no signal & no power to keyboard or mouse. Removed card and still nothing. Reset BIOS again and then it was running again (without a graphics card & after changing BIOS to AHCI)
I then put my old, but working, graphics card in the same slot and nothing. Removed card & had to reset BIOS to get it to boot up again.

I am assuming my MOBO is playing up as it seems to forget things once you use a PCIe slot. The date & time are correct so it does not seem like the battery is flat. I shall remove the battery to clear the CMOS tonight hopefully (could have done it last night but watched that awful England game instead)

Spec is
GIGABYTE GA-Z77-D3H Intel Z77 (Socket 1155) ATX Motherboard
Intel Core i5-3570K 3.40GHz (Ivy Bridge) Socket LGA1155 Processor
8GB (2x4GB) Corsair Vengeance Jet Black Low Profile 1600MHz CL9 DDR3
240GB Mushkin Chronos 2.5" SATA 6GB/s (SATA-III) Solid State Drive
MSI HD 7850 Twin Frozr III OC 2048MB GDDR5 PCI-Express Graphics Cards

I shall have another fight with it tonight but if anyone has any ideas then it would be much appreciated. All the components are less than a year old so I could claim on warranty but I need to find out which part (or parts, if any) is faulty.

Many thanks,


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September 11, 2013 at 06:56:42
✔ Best Answer
You listed your system specs but left out the most important item - the PSU. What is the make/model/wattage & amperage specs?

"I shall remove the battery to clear the CMOS tonight hopefully"

You don't need to remove the battery, just use the CLR_CMOS jumper (that's why it's there). I've seen posts where some people take the battery out & leave it out overnite to make sure the BIOS clears - it only takes a couple of second to clear, not minutes or hours. Just make sure the power cord is unplugged because the PSU standby power can prevent the BIOS from resetting.

From your motherboard manual:

• To clear the CMOS values, use a metal object like a screwdriver to touch the two pins for a few seconds.
• Always turn off your computer and unplug the power cord from the power outlet before clearing the CMOS values.

message edited by riider

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September 11, 2013 at 07:49:56
Thanks for the reply, I will do that tonight & see what happens

PSU is;

Corsair 850W AX850 Modular PSU bought Xmas time.

Been running with that all of this year so far.

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September 11, 2013 at 08:38:01
Do you have the auxiliary power connector to the graphics card, plugged in?

message edited by OtheHill

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Related Solutions

September 11, 2013 at 08:53:58
I have the 6 pin plug connected straight from the psu.



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September 11, 2013 at 08:58:43
"Corsair 850W AX850 Modular PSU...Been running with that all of this year so far"

OK, but you said "Thought it might have been a psu failure so I swapped my psu"?

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September 11, 2013 at 09:18:12
The old one I currently have installed is;

Hiper 580W Type-R Modular PSU SLI/CrossFire Certified

I said I thought it was my psu as it seemed the most likely/easiest answer before I stripped pieces out. I haven't got round to putting my 850w one back in yet,

It boots up fine with this 580w psu, without GPU installed but I have the same problems t whenever I try to install a graphics card, even an old 4850HD. I have to load default BIOS to get it to boot up.

I am now going home so I will have a go at it later and let you all know what, if anything, occurs.


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September 12, 2013 at 06:06:34
Last night I just made sure that it was still booting up ok without a gpu, which it did.

I then turned everything off, removed power lead, held the power button on the computer down for e few seconds and then cleared the CMOS (very easy as mentioned earlier) and then rebooted. It loaded defaults BIOS & booted up fine.

I then thought I would try my latest GPU (HD7850) & see what would happen. Which was nothing, no signal & did not boot up.
I then removed that card and inserted my older gpu (4850HD) without clearing the BIOS & it booted up without any problem.

That's as far as I got last night. Tonight I shall try my 850w PSU with the old card & see if it boots up ok. Then I shall try my 7850 & see what happens but it seems like it could be my graphics card.

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September 12, 2013 at 11:25:40
Is the new graphics card getting seated fully? Sometimes RAM is in the way.

Do you hear any beeps when starting?

I assume you have the auxiliary CPU power connector plugged in?

Your 850 watt PSU should handle anything you throw at it but you could check the voltages on all the rails in the BIOS or using HWMonitor.

Might be a defective card. Where did you get it from?

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September 13, 2013 at 04:25:14
I swapped my PSU from my old 580w for my current 850w and everything booted up ok.

I then swapped my old gpu with my HD7850 and nothing, power to the fans, but no signal. Put my older graphics card back in and it booted up again so I guess it is my GPU which is at fault. Presumably this could have corrupted the BIOS which is why I could not get it to boot at all without going into the BIOS and changing the setting to AHCI drive?

I bought the card from so I will check out the T&C's etc. Hopefully they aren't too bad with returns but at least I seem to have identified the problem so thanks for everyone's help and ideas.

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September 17, 2013 at 03:10:30
Still having problems, screen flickers & occasional boot fail.

The flickering screen happens with or without the old graphic card in, and also was happening to less extent when the HD7850 was in before the big fail. The screen is less than a year old also.

I am going to build a 2nd rig from all my replaced parts (mobo, ram, cpu etc as I don't tend to through much away) and try my graphic card and see if it definitely is FUBAR

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September 18, 2013 at 09:49:34
Check the signal cable to the monitor and also try the monitor on another computer.

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September 19, 2013 at 01:24:43
Well I stuck my HD7850 gpu in my old rig (all the parts I replaced last year) and it booted up and has installed the drivers and is displaying on my new monitor which is not flickering.

I shall update everything see if it behaves, then I'll swap the psu's over and see if that recreates the flicker.

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