Video Card Problem

Hi all, I have recently bought 3 video cards and returned all 3 in 7 days lol. First it was a galaxy gtx 570, then a evga 570, finally a HD 6950, the problem is they all power up but, I always get 1 long beep and 3 short ones, which means its a video display error. Now, when I first bought my gtx 570 last Sat. my PC booted fine I installed the new drivers, ran the PC hard Sat night and all day Sun for 12 hrs, gaming, benchmarks, blu ray movies etc. Now comes Mon, thats when I started getting the beep codes on boot up. So I replaced the card to a evga 570, then finally ati 6950 all from Micro Center, and still nothing, won't boot. My old gtx 285 is 100% fine, this is a weird problem, as I have more then enough power, here are my specs, any advice as to wether or not I might need a new PSU? I also reseted the BIOS cleared the CMOS take out a few RAM sticks to trouble shoot and still nothing. So my PC is as follows:

2 LG blu ray burners WH10LS 30
1 seagate 7200 1 TB HDD
1 samsung 5400 2 TB HDD
Q9550
ASUS P5N-D
GTX 285
X-Fi Fatal1ty
7 120mm fans 1 80mm fan
PC Power & Cooling 750w <---to weak for a GTX 570 or a HD 6950 2GB ???
8GB Corsair DDR2 RAM
(Nothing is overclocked)

Thanks all.

That is strange. I wonder if it is the motherboard. Have you tried the gpu in a different computer yet?
Edit: it could be psu I wouls try a different one as well

Hmm.. Mobo issue, doesn't seem like one being I have a Gen 2.0, and all PCI-E cards are compatiable with v1.0 to 2.1 and vice versa. But you never know. Now I have my old 285 in. I do not have another PC or PSU to test it only a tiny netbook as a back up , So I'm going with my best bet and buy this PSU http://www.newegg.com/Product/Produ...re=coolwe_master_1000w-_-17-171-049-_-Product 80A on the 12v rail, thats a lot, and this is a good brand.

I still doubt it's your PSU. Is it a newer PC Power and Cooling unit? I hear some of the newer ones have issues. If it's a few years old, however, I wouldn't think that you should really have a problem

Your PSU can certainly kill your GPU's as I came to learn after 6 of them died.......

The PC Power & Cooling I bought in Nov. of 2006 its not the Quad-SLI. Yes its the older one. Well yes I believe that too a PSU can kill your GPU or anything else inside your case. Well, as we speak now..err..type LOL, I have exchanged for the 4th time another video card I said let me take just one more chance before I actually bring in my PC to Micro Center, blah I probably know more then them LOL. Anyway I got a 560ti which takes a little less power, actually it needs a 500w psu not a 550w. Well now its running fine, but I have to give it a few days or a week to see how stable it will be. So it seems it was my PSU that was not giving the cards I bought enough power. Oh well at least I have Dx 11 who hoo lol. My PC is still fairly beefy, well just a little it should hold me off till the end of this yr, which I will upgrade fully.

Oh, one more thing my GTX 285 pulls more power than my 560ti, just that alone is weird, being all the others cards I replaced need a 550w psu just like my old 285. Maybe its just the way the 500 series cards are.

LOL - reminds me of a time when I tried to put my 8800GT into my PCIe 16 slot that wasn't compatible with 2.0 - exact same type of thing happened - worked fine in other board was just specific to that board. had to actually load a specific firmware on the Card to get it to talk correctly....

Now I know it probably has nothing to do with this system... just reminded me of mine.

Axe

Oh man you need a specific firmware just to get it going...Damn, what a work around. Yeah I got lucky, also thing is both cards and my Mobo are PCI E 2.0 ...Yeah I guess some cards are just specific to certain Mobo's you have to be lucky it seems lol. Like gambling

You most likely have a BIOS incompatibility. I say this because three modern GPUs all do the same thing, but a GPU from the generation of your board runs fine, and if it was the PSU there would be problems with the current GTX 285.

Since you have an ASUS board use the EZ Flash option.

Go to ASUS and download the most recent BIOS version for your board to a thumb drive.
Follow the EZ Flash directions to update your MB Bios.

Make sure to follow the instructions. Make sure the board is set to default BEFORE you flash the BIOS.

yeah, sounds like a bios update might be in order, if that doesnt work i'd look at the motherboard, then i'd look into power supply.