Crash Reboot & GPU not detecting

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subcide

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Jul 20, 2014
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4,510
Hey everyone.

I've recently built a new PC, it's about 3 weeks old, and has been running fine. Last night, while playing a game, the system powered itself off without warning, just like someone had flicked a switch.

When it restarted, the screen was blank and the GPS fans were running at 100% speed. It's rebooted like this once before apparently, but ran fine afterwards.

I switched to the onboard gfx and the computer loads up fine, but it won't detect the card to allow me to install latest drivers, or check temperatures, or anything.

The gfx card is a super clocked EVGA Gtx 780, and the power supply is a 600W corsair PSU.

I have unplugged everything and left it, held power button to drain batteries and stuff, removed the card and put it back in, but nothing has helped so far. It's a mini itx case, so there's no other pcie slots to try moving the card to.

(This is the first PC I've built in probably 12 years, so consider my knowledge to be slim to none. Thanks for your help.)

Any suggestions? Should 600W be enough to power this card?
 
Solution
Thelps
It's possible your PSU is struggling with the card. I'd say a minimum for a standard 780 GTX is 650w and 750w actually gives more breathing room for other peripherals such as USB devices and extra HDDs.

Since the card is overclocked I'd recommend at least a 750w PSU.

To make absolutely sure it's the PSU that's underpowered you could test it with another PSU, but I'd say that's almost definitely the case.
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Thelps

Thelps

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Feb 20, 2013
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Firstly, it's probably corrupt GPU drivers, however, that might not be the root of the entire problem.

When you boot your computer spam the 'Delete' key immediately as the machine starts up. This will boot your computer's BIOS interface wherein you will find a CPU Temperature Monitor readout. If that's anything above 45 degrees celsius then your PC is shutting down because your CPU is overheating.

If that temperature is fine then reinstall yor graphics card drivers by going to Add/Remove Programs in Control Panel, deleting your current GPU driver and rebooting your system.

You may also want to go to Control Panel > System > Device Manager > Display Adapters > Richt-Click your GPU and select 'Properties' > Go to the 'Drivers' tab and click 'Uninstall'. Reboot after that.

Proceed to download the latest stable drivers for your GPU from a reputable source such as the manufacturer or Nvidia/AMD.
 
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subcide

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Jul 20, 2014
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4,510
Thanks, the system temp is 28c and the cpu is 35c. I tried uninstalling the driver, running the guru3d display driver uninstaller as per some other thread replies, but now when I go to reinstall the latest drivers, it just tells me no compatible card can be detected.
 
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Thelps

Thelps

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Feb 20, 2013
855
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20,515
It's possible your PSU is struggling with the card. I'd say a minimum for a standard 780 GTX is 650w and 750w actually gives more breathing room for other peripherals such as USB devices and extra HDDs.

Since the card is overclocked I'd recommend at least a 750w PSU.

To make absolutely sure it's the PSU that's underpowered you could test it with another PSU, but I'd say that's almost definitely the case.
 
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