Computer won't boot when graphics card is plugged in with the PCU

Bryan5397 · Jan 5, 2014

Ok so my specs are
- 500 watt pcu
- amd radeon hd 5750
- Dell optiplex 755
Ok my computer worked fine for a few months til I say a flashing amber light on the power button. So what I did was to test the pcu and replace the motherboard. When the new motherboard was installed it still showed the blinking amber light. I then tested the pcu again by plugging in the hard drive. I heard the hard drive spinning so I then plugged in the graphics card. When I plugged in the graphics card, the pcu turned off. I removed the pcu cord from the graphics card and the pcu started again. Is the graphics card broken or do I need a higher watt power supply because it was working before.

TechCIDLC · Jan 5, 2014

Would throw that Dell away and get a new PC.

mikes1992 · Jan 5, 2014

your Power Supplys wattage is more than enough to run the card... what brand is the PSU? You Should avoid using Cheap PSUs and if you do I'd recommend looking at the reviews first as some cheap power supplys could be a death sentence for your computer if it's not stable!

Don't plug in or unplug components while the PSU is switched on... you may shock the components. This may be Paranoia but I assume it's dangerous... I killed a friends PC after I'd worked on it while the PSU was still powered I don't know what the cause was but I learnt that hard way that you have to be careful.

Does your computer have an intergrated graphics card that you could try to boot with? see if it will bootup without the card plugged in... if it does than it narrows it down to a PSU or GPU fault or both (the PSU could have killed the graphics card)

mikes1992 · Jan 5, 2014

your Power Supplys wattage is more than enough to run the card... what brand is the PSU? You Should avoid using Cheap PSUs and if you do I'd recommend looking at the reviews first as some cheap power supplys could be a death sentence for your computer if it's not stable!

Don't plug in or unplug components while the PSU is switched on... you may shock the components. This may be Paranoia but I assume it's dangerous... I killed a friends PC after I'd worked on it while the PSU was still powered I don't know what the cause was but I learnt that hard way that you have to be careful.

Does your computer have an intergrated graphics card that you could try to boot with? see if it will bootup without the card plugged in... if it does than it narrows it down to a PSU or GPU fault or both (the PSU could have killed the graphics card)

mikes1992 · Jan 5, 2014

when you switch on the computer is it posting any diagnostic beeps?

if so, what is it doing? E.g. 2 short beeps 1 long... etc...

Bryan5397 · Jan 5, 2014

Yes it does have an intergrated graphics card because I am typing with the exact pc that has the problem. Well the pc randomly had shut off a few weeks ago and the I got the amber light. I think that the gpu might be dead becuase nothing moves. I can afford to buy a replacement but I want to make sure its nothing else.

mikes1992 · Jan 5, 2014

Does the Bios beep when the GPU is plugged in and the orange light comes on the power LED and it fails to boot?

Also, what brand is the PSU?

Bryan5397 · Jan 5, 2014

It doesnt beep when its plugged in since the whole system wont boot at all. I will check what type of psu it is,

mikes1992 · Jan 7, 2014

I don't suppose you have another computer that you could test the GPU in?

mikes1992 · Jan 7, 2014

the HD 5750 only pulls ~ 85w under full load so it shouldn't really be that stressful for your PSU

How long have you been running that hardware config?

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Computer won't boot when graphics card is plugged in with the PCU

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