AMD 7750 fans spin, no display

Gurrry · Jul 19, 2013

I have an hp h8-1214 that i got from best buy. It supposedly has 300w psu, amd fx 6100, and an amd 7450.

I went to frys to get a new card, the amd 7750 because it was the best card for the current psu i have.

I installed it yesterday, the fans spin, however nothing is shown on my monitor. It goes into powersave mode as if nothing is connected to it at all.

Im beginning to think its my psu or the gpu is dead.

I cant test the gpu on any other computer and the pci slot isnt busted because my stock card (amd 7450) works fine when i put it back in.

Im fairly new to all of this upgrading stuff, any help is appreciated.

Shadowblade2652 · Jul 19, 2013

Try plugging the video plug from your monitor on a different slot, that may help. You may need to use the DVI to VGA adapter included with your new 7750.

Kingbob · Jul 19, 2013

Either you aren't plugging the monitor correctly (refer to manual) or you need to return your GPU and get it replaced.

Gurrry · Jul 19, 2013

Im using hdmi to monitor using an adapter that came with the monitor.

There was no adapter for dvi with my card.

Could power be the issue or is it more likely to be a busted unit? Now that i think about it, the box was semi open.

Gurrry · Jul 19, 2013

Also the sticker on the psu said 262 watts, not 300w.

Shadowblade2652 · Jul 19, 2013

perhaps you don't have enough power? Try to see if you can get a new PSU.
Also if you want better performance for like $5 less, try the 7770 GHz edition, as I've seen the MSI version retail at about $95.

Kingbob · Jul 19, 2013

Hmmm... It actually could be your PSU.

I'd recommend this PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817256061

Shadowblade2652 · Jul 19, 2013

I'd go more with a Corsair CX430, which is only $30 - $40 and if your gpu doesn't work it won't be the PSU because corsairs don't normally fail.

Kingbob · Jul 19, 2013

Actually the Corsair builder series isnt all that great... It's about the same as the one I put up there.

Bottom line: upgrade your PSU because it is most likely your problem

Here are the two PSU's we recommended:

500w:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817256061

430w:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026&Tpk=corsair%20430&IsVirtualParent=1

Gurrry · Jul 19, 2013

There was a coolmaster 500w for 50 bucks at frys. Should i try getting that and replacing the gpu with a 7770 since ill have more power? I kind of want the asus one as it seems smaller and the gigabyte is a behemoth..

If it is a psu issue, do my current symptoms check out? Like the fans spinning and pc coming on but no display whatsoever (Not even bios)

Kingbob · Jul 19, 2013

Yes those are symptoms of a low power PSU. It can supply power for the basic functions, but it can't power the GPU its self. The ones I posted above are much cheaper than $50 FYI. and you would like a 7770 or a 7790 much better.

Gurrry · Jul 19, 2013

Is coolmaster a good brand or will it atleast get the job done for a 7750 or 7770?

Kingbob · Jul 19, 2013

Gurrry :

I'm pretty sure that a 430w PSU will be fine, however to get the best efficiency, you'd be better off with a 500w PSU

Shadowblade2652 · Jul 20, 2013

For better efficiency go with an Antec or Corsair or Seasonic PSU as those are mostly 80+ rated for <$50, and cooler master isn't the greatest brand...

Gurrry · Jul 20, 2013

So i went and got a lepa 500w.

Hooked it up, then realized the atx 12v connection on my board is 4 pins and the one on the psu is 6.

Is there a way around this?!

Kingbob · Jul 20, 2013

Gurrry :

That might be a GPU connector (they are 6 (+2) pin). The 12v connectors should be 4+4, you only need to plug in one 4 pin head.

Gurrry · Jul 20, 2013

I only had a 6 pin and a 6+2 after i connected everything.

On the box it says it has a 24 pin main power, 4 pin peripheral, 6 pin pci-e, 6 pin + 2 pci-e, sata, 4 pin floppy, and a 4+4 pin CPU.

Im guessing the 4+4 pin is the one i need to use but i couldve sworn i only had the pci cables left once i hooked it up.

Also, the 4+4 is one solid piece. Its not broken in half. Do i have to split it myself?

Kingbob · Jul 20, 2013

Thats not good. If it says 4+4 on the box, it should be two separate things...
Where did you have the 4+4 connector plugged in?

Gurrry · Jul 20, 2013

On further inspection, it seems like the 4+4 pin is break-off-able. But is this really the right cord? Its black and yellow wires and it has the mesh cover on the outside.

Is this what im supposed to hook into the atx 12v molex slot?

Kingbob · Jul 20, 2013

There are two connectors on your motherboard, the 24-pin ATX connector, and a 4 or 8 pin CPU power connector. If this is the power connector near the CPU, then yes, the 4+4 should go there.

Gurrry · Jul 20, 2013

So do I just break this 8 pin into 2 fours with a little force?

Kingbob · Jul 20, 2013

It should come apart with little effort. You said that it seems like its supposed to come apart, it should. Make sure everything is unplugged!

Gurrry · Jul 20, 2013

I just opened my pc. I dont see a place where i couldve used that 8 pin. I must have over looked it once I panicked and thought that i needed to use a PCI-E cable there.

FML

So, i guess im going to put her down for another surgery and try this 4 pin.

I guess my next question would be, if this works, do I need to uninstall my previous gfx driviers? Also, will it be able to display through HDMI on boot with the new GPU or do I need to get a VGA cable?

Kingbob · Jul 20, 2013

You should be able to boot through the GPU, itll just be a really poor resolution until you get the drivers installed.

Gurrry · Jul 20, 2013

Ok Bob, Ill try this out. Thanks again for helping me man. Ive never done anything like this before and youre giving me the confidnece to keep trying.

Ill post an update barring any major electrical shock that kills me.

AMD 7750 fans spin, no display

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