New Graphics Card Causing PC Not to Boot

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Hoboeater

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Mar 14, 2013
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Hello, I recently bought a Radeon 7870 to replace my Radeon 7770. I'm not very experienced with building computers, but I had a general idea of how to remove/install a card.

The thing that surprised me was the two power connectors on the graphics instead of one on my old card. So I just plugged in the 6 pin connector I was already using and a 6+2 pin connector into the new card. However, when I tried to turn on the computer, the computer would shut off instantly. I tried using the molex connectors, but that didn't work.

I removed the card and plugged in my old card and the computer turned on. What am I doing wrong?

My system:
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack
Processor: Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz (8 CPUs), ~3.9GHz
Memory: 8192MB RAM
DirectX Version: DirectX 11
Card name: AMD Radeon HD 7700 Series
PSU: 600W
Case: Corsair Carbide 300R
Motherboard: Gigabyte B75M-D3H
Manufactured by CyberPowerPC
 
Solution
yasserBasha
My dear friend ....

You answered your own question when you said
" even with my current card (AMD 7770), the computer can barely boot up. So I would have to switch off and on the PSU in order to try powering the computer again. "
which means that your current psu isn't really sufficient or good enough
Plus it's a win-win situation; you get the quality psu (seasonic - corsair - antec) and the VGA works (psu problem) OR you get the psu and Vga doesn't then you refund it and get another while having a peace of mind with the psu.
Best wishes, friend
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yasserBasha

yasserBasha

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Mar 23, 2013
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Do you have quality PSU?
(Seasonic-Antec-Corsair)

Also there is another point :

What matters is +12V amperage because this is the power used by CPUs and graphics cards as well as some other components such as hard drives and most fans. Some 350W PSUs can handle a 7850
(for example) with a low power CPU such as an Ivy Bridge i3 or an AMD Trinity quad-core APU with its IGP disabled, some 600W PSUs can't.
You have to check the +12V amperage of a PSU and find the +12V consumption of your computer to find out if a PSU is good enough.

check for these and keep me posted
 
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yasserBasha

yasserBasha

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Mar 23, 2013
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Cheap PSUs often have a weak 12v rail and low effiency, which means you probably won't get the full potential out of the rated watts of the PSU.

power hungry systems consumes a LOT of power (i7-3770k uses 77w but when overclocked requires more) + the fans, HDD ...etc
 
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H

Hoboeater

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Mar 14, 2013
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Hi Basha,

No, I don't have a good PSU, it's a stock PSU. Do you think there's a good chance that the PSU is the issue? Because if it is, I'll buy another PSU, otherwise I'll refund the video card.

However, I did check the amperage of the cables on the PSU with a multimeter and they all read 12V

A side note is that even with my current card (AMD 7770), the computer can barely boot up. So I would have to switch off and on the PSU in order to try powering the computer again.

Thanks for your reply! I really appreciate it!
 
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H

Hoboeater

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Mar 14, 2013
19
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Hi Basha,
Sorry, but you didn't really answer my previous question. "Do you think there's a good chance that the PSU is the issue? Because if it is, I'll buy another PSU, otherwise I'll refund the video card." I don't want to buy another PSU to find out its not the issue.
Thanks for help again!
 
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yasserBasha

yasserBasha

Honorable
Mar 23, 2013
853
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11,060
My dear friend ....

You answered your own question when you said
" even with my current card (AMD 7770), the computer can barely boot up. So I would have to switch off and on the PSU in order to try powering the computer again. "
which means that your current psu isn't really sufficient or good enough
Plus it's a win-win situation; you get the quality psu (seasonic - corsair - antec) and the VGA works (psu problem) OR you get the psu and Vga doesn't then you refund it and get another while having a peace of mind with the psu.
Best wishes, friend
 
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