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New Graphics Card And PSU Slowed Down My PC

Last response: in Graphics & Displays
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August 18, 2012 11:50:44 PM

So i bought a new graphics card the other day and to go with it a power supply. I was upgrading from an onboard graphics and a stock power supply. The problems started occurring when i tried to install the drivers for my new Sapphire HD 6770...it said that the detection drivers had failed...but the installation was successful. Then when i restarted my pc i noticed that the speed had drastically decreased. Programs took time to open and games would freeze. Eveytime i open firefox and open a few tabs it stops responding and i have to restart the pc. I uninstalled the onboard graphic drivers but to no avail. Whenever i try to uninstall the ATI drivers the pc stops responding and i have to reboot. I ran it in safe mode and then tried to install the drivers again but the same problem occured...driver detection failed. Is there something wrong with my PSU or my Processor or Mobo? It was running fine before all this.

My Specs are:
Processor: i3 540 @ 3.06 Ghz
Mobo: Intel DH55PJ
RAM: 4 Gb DDR 3
HDD: 500 Gb
GPU: Sapphire HD 6770
PSU: 460 W Cooler Master Extreme

Your help will be most appreciated! :) 
a c 291 U Graphics card
a b ) Power supply
August 18, 2012 11:58:52 PM

Did you plug in the 6-pin connector from the power supply to the graphics card?
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August 18, 2012 11:59:49 PM

Yeah i did and the graphics card is working i did a play a few games but they started freezing and stuttering.
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a b U Graphics card
a b ) Power supply
August 19, 2012 12:07:12 AM

Did you remove the old drivers when you installed the new drivers? (no idea if the onboard graphics had other drivers...)
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August 19, 2012 12:10:04 AM

i did uninstall them but they were Intel HD Graphics drivers for the onboard card...but yes i did uninstall them after i installed the ATI ones cause i thought they wouldnt make such of a difference.
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a c 291 U Graphics card
a b ) Power supply
August 19, 2012 1:02:09 AM

Are you plugging the monitor to the graphics card and not the motherboard?
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August 19, 2012 1:03:38 AM

i am plugging it into the graphics card.
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a c 291 U Graphics card
a b ) Power supply
August 19, 2012 5:48:30 PM

I'd suggest windows reinstall.. You've obviously got a driver conflict, and it's very hard to find out what's causing it and even harder to fix it. Reinstalling windows is probably the fastest way.
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August 19, 2012 7:38:58 PM

Hmmm im going to try that..but if that doesnt work..then what? But how can it be a driver conflict if have deleted the Intel HD Graphics? :/ 
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a c 291 U Graphics card
a b ) Power supply
August 19, 2012 7:52:28 PM

I'm sure it will help. Sometimes it's very hard to get rid of the remnants of old driver, even if you uninstall it, it doesn't mean you got rid of it all.
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August 19, 2012 7:54:15 PM

Im going to try that tomorrow...Hope it works!
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August 19, 2012 8:09:31 PM

Wait another thing happened...and this happened the first time i installed the graphics card...when i started my pc...it went from the intel mobo screen to a black screen then Intel Boot Media opened...and said that it had failed to load boot media...PXE 2.0 Failed to load...something like that...is that related to my hard disk?
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August 19, 2012 8:13:53 PM

And another thing why didnt my pc detect the graphics card...It should have said something like New Hardware Detected...but it didnt...and i guess thats the cause of the driver detection error...im so confused! :( 
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August 19, 2012 10:18:41 PM

Bump
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a c 291 U Graphics card
a b ) Power supply
August 19, 2012 10:55:02 PM

Don't bump posts..

Anyway, reinstall windows and tell how it went. Can't help anymore before you do that.
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August 20, 2012 7:07:20 AM

Okay sorry and will do.
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!