Brand new GPU wont start

IvanOtac · Feb 23, 2017

Hey guys, i got new PSU and GPU and PC wont start...Corsair CS750M and RX 480 Nitro, the thing is when i put my old GPU in, PC sometimes start, something dont...only indicator that is alive is little light on MOBO, with new GPU wont start at all...everything is pluged in nice, PC is clean from dust...what could be the problem? Any help would be nice, tnx.

CropEditPaste · Feb 23, 2017

Check power cables, PCIE lane and the card interface. Try unplugging computer and taking out the cmos battery, and if not that then reset the BIOS.

elbert · Feb 23, 2017

Sounds your PSU has issues of starting your old less power hungry GPU thus sometimes starts. With the new card it just can't output enough. I suggest testing with another PSU if possible. You may need a motherboard bios update also.

CropEditPaste · Feb 23, 2017

It may be the power supply, try RMA on it and see if you can get a new one.

IvanOtac · Feb 23, 2017

Ok guys, old GPU working just fine, rebooted PC couple of times and it's fine...old GPU is 2GB AMD Radeon HD7850, so the new one is less power hungry...im gonna try with BIOS update and get back to you, ty all

elbert · Feb 23, 2017

Actually the 7850 does require a bit less power. The rx480 TDP is 150 vs the 7850's TDP of 130 watts. The 7850's draw is about the same as the 1060.
http://hwbench.com/vgas/radeon-rx-480-vs-radeon-hd-7850

IvanOtac · Feb 23, 2017

Didnt know that, tnx for info, but i guess Corsair CS750M should have power for it, right?

The Paladin · Feb 23, 2017

I have a question are you mounting your heatsink (assuming aftermarket) with metal risers, I am asking because I ran into this problem this weekend and found that bracket made for my heatsink (aftermarket) where metal and softly scratched the top layer of the motherboard and this H81MHD3 has lines of power running too close to the mounting holes (damn MATX board) to the mounting spots, I cleaned and applied thick transparent shipping tape on the board and remounted my heatsink and the problem was solved.. maybe something to look at.

IvanOtac · Feb 23, 2017

If you mean by mounting heatsing on CPU, then yes, but i didnt touch it at all, just swipe out old GPU and PSU and replace them with new ones. As i said, old GPU working just fine, new one doesn't even want to start PC at all, like it's dead.

The Paladin · Feb 23, 2017

curious, new gpu with new PSu = works fine, new GPU with new PSU = not work ?
you sure you plugged in the 8pin connector to the video card ?

IvanOtac · Feb 23, 2017

Yep, every single thing connected properly...only option left is to try to update my BIOS, but i never done that before.

The Paladin · Feb 23, 2017

what motherboard and video card are we talking about anyways ?

IvanOtac · Feb 23, 2017

It's Sabretooth x79 and RX 480 8gb Nitro

elbert · Feb 23, 2017

Update the bios and if that doesn't help RMA the PSU.

IvanOtac · Feb 23, 2017

Elbert, im little bit afraid to update BIOS by myself so im gonna wait for someone with exp for that. What is RMA stands for?

elbert · Feb 23, 2017

It means return merchandise authorization. There are 3 ways to update your bios. The best and most safe is download and copy the uncompressed bios to USB. Put the USB in the special back USB slot and hold the button for 3 seconds to flash you bios. It's called backlash on your motherboard.
https://www.asus.com/us/Motherboards/SABERTOOTH_X79/

IvanOtac · Feb 23, 2017

That is very usefull info, im gonna try that tomorrow, here is almost 12am...tnx a lot man

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