New gpu, no signal on monitor (Windows doesn't boot)

[Matthew Simpson]

I know there are countless threads on this topic, but none of them had solutions that worked or were specific to my problem.

I recently got the HIS Radeon 7750.
I uninstalled my 6570 and its drivers, and turned off the onboard video in my bios. When I install the 7750 the monitor says no signal. I've tried 3 different monitors and HDMI, VGA, and DVI. When I boot the PC I waited a minute or two to see if Windows booted. I pressed the power button on my PC very quickly and it turned the PC off right away which means Windows didn't boot. My old gpu still works for now.

Any help or solutions would be much appreciated.

 

[bootcher]

Some BIOS have an option also to initialise pci express graphics first instead of internal graphics, have you tried this?
If possible, can you install the card on another pc to check if it works?

 

[Matthew Simpson]

I couldn't find that option in the bios all I could find was to turn off the onboard video. I have a HP p6-2103wb

 

[bootcher]

The recommended PSU for a 7750 is a 400 watt, but your PC comes with a 300 watt PSU. This might be your problem.

 

[Matthew Simpson]

I've heard time and time again that the recommended psu wattage is only for liability. People have ran the 7750 on older, less powered psus like 225w and 250w since the tdp is only 55w. I'll be able to test it on another computer in the next few days.

 

[bootcher]

The watts are not relevant if the PSU can provide enough amps. HP is not exactly known for its quality psu's. But it should at least boot with it since the GPU is not under full load during boot. If you could test it in another PC you know for sure that the card is OK and it must be something else.

 

[Matthew Simpson]

Alright, this psu is
12va 12.0A
and
12vb 160A
I'm not sure what the other ones psu is yet. Do you think a Dell 300w psu will work better?

 

[bootcher]

I think it should boot with any PSU as you would only run into problems when the GPU is under full load and the psu can't provide enough power.

 

[MrCommunistGen]

A full list of your system specs never hurts.

I essentially agree with bootcher. If your HD 6570 boots up in the system and the only thing you've changed is that you've installed a HD 7750 then the PSU should provide enough power to at least boot Windows. Modern video cards have pretty low power requirements when they're not being heavily loaded (3D games or GPU Compute). In most scenarios the power recommendation on graphics cards is greatly overstated to help account for people buying bad PSUs that don't actually put out their rated wattage. I'd imagine that even under load your whole system probably doesn't *actually* draw more than 200W.

Are you sure the HD 7750 works? Can you confirm in a different system? Although I don't think most 7750's have a 6-pin PCI-E power connector, if yours does and you didn't plug it in, it can cause the GPU to not function and possibly prevent the system from booting. Sorry if I'm stating the obvious, but you're plugging your display into the outputs on the video card, right?... not the motherboard...?

 

[Conker2698]

Your output might be at a different Hz to what your screen supports, have you tried booting in safe mode and download the GPU drivers?

 

[Matthew Simpson]

Yeah I'm plugging it into the video card. I guess it is my psu I'll see with a different system soon.

 

[bootcher]

By the way, have you tried to reset the BIOS after installing the card?