PC won't BOOT with new Graphic Card

July 30, 2013 at 03:38:53
Specs: Windows 7

This is so crazy.

I have bought a Radeon HD 7870 to upgrade my graphics (HD7770)
Whenever I put it in, my PC wont boot. Light turns on on PC; fans run, but black screen and it doesn't boot up. (made sure to make sounds in windows startup to see if it was just a monitor issue or something, but it doesnt even boot up, just stands there with fans running.

I purchased a second 7870, as I thought the card was DOA, but it was exactly the same issue.
I tried putting back my old 7770, and it booted up without trouble.

I then looked at the internal parts and figured it might be PSU/MB/BIOS/CHIPSET updates.

My PSU is a Corsair GS600Watt, so should be more than enough power + it works flawlessly with the 7770, so I guess that's out of the Q.

The BIOS was an old HP bios and I could not find an update. So I found a new simple Asrock H61 MB with PCI X16 port for the gfx and bought that, hoping it would resolve the issue.

SAME EXACT THING happened.. The PC won't boot up. Whenever I switch the cards back to my old 7770 it works without issues..

So now im pretty baffled.. can it be?? Did I get 2 cards sent to me, both DOA? I highly doubt it. What can it be? I even tried removing/switching ram blocks, cleared CMOS, everythign!?! but no fix.

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July 30, 2013 at 03:57:35
From what I can see, the 7770 uses one 6 pin PCIe power connector and the 7870 uses two 6 pin PCIe power connectors. Are you using two PCIe connectors? If not, then this might be your problem.

Have you tried updating your graphics driver?

Did you try the old graphics card on the new motherboard?

Post all of your specs in case there is something else there that might be the issue.

You have to be a little bit crazy to keep you from going insane.

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July 30, 2013 at 04:03:52
Yes, of course I use both 6pan PCIe connectors :)

Yes all drivers updated, BIOS, GFX, Chipset, everything.

On the old Motherboard the old graphic card works. Also on the new one, the old graphic card works. The new 7870's don't work on any.

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July 30, 2013 at 04:17:18
I read through your original post too, but if both of the 7870's you have don't work in a new motherboard I suspect both cards have been somehow damaged. Did both cards come from the same place? Did they come in the post? (I had 3 replacements in a row get destroyed in the post) If your power supply is modular, is the PCI-E 6pin cable faulty? (If you have a spare swap it) If you have a totally seperate PC you can test the cards in we can probably determine if those cards are faulty or if there is something in your setup causing the issues.


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July 30, 2013 at 06:18:34
Could it be the that the PSU is faulty, even though it works with the 7770?

As said, It's a Corsair GS 600watt so the wattage should be enough - Even though, shouldn't the PC be able to boot?

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July 30, 2013 at 06:24:51
If the 7770 only uses 1 PCI-E power connector and the 7870 uses two one of the cables could be faulty, try using one then the other on your 7770 if it runs with either cable you should be OK. But the only way to test is to try with another PSU. Seems like a very odd situation.


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July 30, 2013 at 06:27:34
Very odd indeed! I of course have tested both PCIE cables with the 7770 and they both work.

I will be driving to a friend to test with his PSU in a bit. Will give an update.

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July 30, 2013 at 08:39:13
Tested with Corsair 750watt PSU. Same error.

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July 30, 2013 at 11:15:28
DO NOT double post. Go back to your first thread.

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