Compatability + reccomendation

Hello all im in need of some advice, Since 2008 3 months after i built my first comptuer my 8800GT starting screweing up (i would get green dots all over my screen) but since i didn't register for the warranty i had to stick with it for years.
Now it seems to have finally died, whats the best way to ensure it is dead so i dont buy a new card for nothing?
At the moment my monitor is restricted to the lowest screen resolution and its grey with lines running accorss the screen ( http://i260.photobucket.com/albums [...] 142236.jpg )

This is the system that i am currently using ( http://i260.photobucket.com/albums [...] 010001.jpg )
P5E-V HDMI
Core 2 Quad Q6600
G8800GT 512MB EVGA
Corsair HX-620

The graphics cards that i have been looking at are the
ASUS 1GB GTX560 PCI-E VGA Card $194 Or
ASUS 1GB 6870 PCI-E VGA Card $218
Can someone make a recommendation about which of these cards will work best with my existing system?
Truth be told im leaning towards the 6870 because i have only ever used nvidia cards and i have always had problems, my bro has an AMD on his and he has had no problems with it at all.
So what do you all recommend i should do?
Edit: Oh an i bought battlfield 3 the day it came out and i am yet to play it :-/

I'd say got 6870 and overclock the quad core. should game pretty well

no, that is the recommended specs. NOT minimum. you will play BF3 well, just not on ultra...

id say get a good cooler for your CPU so you can overclock and pick up the 6870. should last you for awhile. you will have to drop a few settings, but not too many for BF3, but still look great

Yes at the moment im using windows 7 but i plan on reformatting and putting a fresh windows 7 on it when i get the graphics card as the computer is 4 years old.

That last bit about not having played BF3 yet was just something i added because i was annoyed that my graphics card was so screwed, im more interested in the compatability of my current system with those two or possibly other cards that will work well with what i have.

your PSU can handle either card, and your mobo supports pci-e x16, so you are fine compatibility wise

disconnect the pci-e card and use the internal one

What did you do after you heard the loud freaking beep? Did you turn off your PC right away or did the beep went away & the PC evebtually booted to Windows?

Okay, please uninstall your graphics driver first before you remove the PCIe card again...

The sound only happens when i unplug the PCI-e, when the PCI-e cable is plugged in the sound doesnt happen.

Yes i have tried that still didn't work.

^Tried that, it didnt work through the motherboards hdmi using a hdmi (from monitor) to mother board hdmi with the graphics card driver uninstalled and the monitor cable taken off, also tried with hdmi on mother board and DVI to monitor still didnt work (im using a second monitor for this test)
I really want to get my comp fixed but i want to be sure that the graphics card is the problem. Whats the easiest/best way to check the status of my graphics card?

you could try her in another computer and do the same thing try to connect two monitors on does your motherboard support the internal and external card in the same time check your bios to find

under the graphic section did you got your motherboard manual the show you where to go

My problem is very similar to this guy and he has the same Graphics card as me so i think its pretty safe to assume that my gpU is the problem.
http://forums.nvidia.com/index.php?showtopic=158040

or if there is a friend that could try your card or have one spare to try in this mobo

Well i tried using a new graphics card i had lying around (8600 GTS) i won it in a comp never used it and it started working normally again. I still get green dots everywhere but overall its working.
Im just wondering should i go for the 6870 ASUS or go upto the 6950 HIS?
Are HIS any good or should i just go for the lower card yet better manufacturer?

My computer doesnt seem to work with my brothers monitor it says VGA no signal. Whenever i get the green dots i press switch user and log back in and it usually goes away but comes back soon after.

My computer doesnt seem to work with my brothers monitor it says VGA no signal. Whenever i get the green dots i press switch user and log back in and it usually goes away but comes back soon after.

My monitor is a ASus vw222u and im using a VGA to DVI adaptor to connect to my computer from the monitor

Is it even possible that my monitor is the problem?

Ok i just tried from my tower to my brothers monitor and i got no signal.
From my monitor to my brothers tower i could see on my monitor and i didnt see any green dots so i think my monitor is ok.
I think my plan now is to get A 6870 Asus or 6950 HIS.
Im also going to reformat my computer and put windows 7 64 bit.

I have checked windows 7 64 bit is compatible and ill ask the salesperson if the cards work with my motherboard.

Change of plan i took it to the guy around my place and im having him put in a HD 6870 Sapphire $235 and also putting a fresh copy of windows 7 premium $60 bringing my total to $295 installation included.
If i had purchased the parts including microsoft 7 it would have cost me $218 for the graphics card and $98 for windows 7 cd, so $316 and i have to do all the work.
It works out cheaper and better for me, if something goes wrong when i get it back ill just take it to him to get it fixed.