No signal after changing gpu

Groundbreaker77 · Aug 2, 2013

Hey, i need help on this one.

I bought a new gpu today and i installed it with a friend but when i boot i get no signal on my screen, either my pc screen or my tv screen.

The gpu is plugged to its 6 pin connecter on a 460w advanced pro series PSU that seems to work fine (i bought it today to for the 6 pin connector that i didn't have on my old one) because all fans are running, on the new gpu, the psu and the cpu. I uninstalled my old drivers too but I still don't get any signal !

It still works fine with my old gpu.

Thank you in advance !

bignastyid · Aug 2, 2013

Whats the make and model of the GPU? That power supply has weak 12v rails and can only deliver 340w and is of questionable quality(a good manufacture would not have sold it as a 460w unit), depending on what video card you have it very well may not be enough to power it.

Groundbreaker77 · Aug 3, 2013

Its an Asus Radeon HD 7790 1gb OC Version, i read on the box that it has 12,5A on each 12V rails, on the boc of the gpu 24A are required, is it not enough ?

bignastyid · Aug 3, 2013

Groundbreaker77 :

If it was a good quality unit it should be enough, but there are no professional reviews, the brand name is all but unknown, and its sold as a 460w PSU but maxes at 340w on the 12v rails(low quality usually cant reach thier advertised power). these are usually signs of a poor quality power suppy. This for example http://www.scan.co.uk/products/450w-xfx-pro-core-edition-p1-450s-x2b9-85-eff-80-plus-bronze-sli-crossfire-eps-12v-fan-atx-v231-psu is a well reviewed, good quality power supply and can deliver 408w on its single 12v rail.

Groundbreaker77 · Aug 3, 2013

So its possible that the pc wont boot because of the psu ? I cant do nothing to solve the problem ? Because it was the only one in stock at my local shop

bignastyid · Aug 3, 2013

It could also possibly be a bad GPU. Do you have access to another system(friends or family members) to test the card in?

Groundbreaker77 · Aug 3, 2013

I will test it on a friends rig tomorrow, if it doesnt work, its the gpu, and if it does what could it be ?

bignastyid · Aug 3, 2013

If the GPU works in another system get a better power supply.

Groundbreaker77 · Aug 3, 2013

My new psu is junk then ? I should sell it if i find someone to buy it ?

bignastyid · Aug 3, 2013

Since you just bought it I would take it back for a refund.

Groundbreaker77 · Aug 5, 2013

I tried the GPU on a friend's rig with a CX600 and it worked fine. I installed it in my PC with his PSU and it didn't boot, i assume that the problem comes from my mobo, i'll wait for a new pc !
Thanks for the replies !

@bignastyid : I live in morrocco, i can't take it back for a refund here

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