Saphire HD 7770, texture glitches and low fps

[Deniz070]

Hello, I bought a Saphire Hd 7770 a few days ago, But it isnt working as should i think,
Example: when i start sims 3 when its loading in the shiny things that come out of the sims 3 logo, through that there are black lines, even with Euro truck simulator 1, bit laggy and on pause menu (with that gray background) i see some white lines moving. I think that my motherboard or CPU is not good anymore, My cpu is on a simple task fast on 100 procent usage, and before i had this videocard i wanted to overclock the cpu, but it failed even with 1 mhz fsb gain. so maybe there is a motherboard problem? before i had this cpu, I overclocked my e4400 from 2.0 to 2.5 ghz and then my onboard graphics freaked out, like those snowflakes when you have no signal on a old tv. it was only with gaming. So i didnt game for a while, and from a good friend i got a E8400. but it seems that it does not work good with my HD 7770.
My system specs are:
Intel C2D E8400 @ 3 ghz idle 25 degrees and after 1 hour prime95 40 degrees
2X 80gb sata hdd
MSI G41m-p26
adata 1333 ddr3 memory
saphire hd 7770 ghz edition, Continuiously 30 degrees.
antec 380w psu with 6pin connector.
Oh and when gaming, my cpu usage is 100 procent.
with the benchmark of gta 4 was cpu useage 100 en gpu useage 39 procent
So What could it be? The motherboard, CPU, Memory or the gpu it self? i reinstalled windows and downloaded the lastest drivers. I want to know what the problem is, because if it is the videocard,
than i'm not going to buy a new motherboard and cpu i had planned, I wanted to buy a new msi b85 motherboard with Pentium g3420 processor. But i would really like tto know what is causing this problem. Sorry for my bad english. I hope you can help me out.
Deniz
PS: The HD 7770 is the last thing i put in this pc. therefore i was not able to play a game because the onboard graphics was strange. even with games like San andreas on 800*600 resolution it was glitching.. like having no signal..

 

[s4in7]

Did you completely uninstall ALL video drivers before installing your new video card? Also, if the PCIe slot that you installed the new graphics card wasn't being used for a while it may have some dust built up in it and preventing good contact between the GPU and motherboard.

First, go download Display Driver Uninstaller http://www.guru3d.com/files_details/display_driver_uninstaller_download.html

Then go to Programs and Features, select AMD Catalyst Install Manager, select Express Uninstall ALL AMD software, and after it's finished reboot. Hold down F8 as your computer is booting and select Safe Mode, once in Windows Safe Mode run Display Driver Uninstaller and select Clean and Shutdown (For installing a new graphics card) and press Run. After that finishes and your computer shuts down, remove the 7770 and with a can of compressed air, air compressor, or your lungs blow into the PCIe slot that 7770 was installed in to dislodge any dust that may be there. Reinstall the 7770 and boot up, download the latest AMD drivers http://sites.amd.com/us/game/downloads/Pages/downloads.aspx (select 32bit or 64bit depending on which version of Windows you have, if unsure right-click My Computer, Properties and it'll tell you 32 or 64bit) and install them.

Should fix the problem.

If not, you may have fried your CPU or motherboard.