Alright here is my story. Hopefully you can help.

Started today, PC worked great. No issues at all. New GTX 470 in the system for a week now. Turn off PC. Go outside to do a few things. Come back forty minutes later. PC refuses to display video, cant tell if it was even posting. Decide to switch GPUs to see if that solves it. It did. 9600GT lets my PC boot with video. Apparently it did boot since it said Windows was shut down incorrectly. Oh well.

So I decide to send a support ticket to EVGA. The guy emails me back, can you verify its not your PSU. He wants me to check my 12v+ rails since I did add one more 6-pin upgrading from the 9600GT to GTX 470. He suggested that i unplug everything but CPU, CPU Fan, GTX 470 in-order to test and see if I get video and a posting with just that. I did. I;m still waiting on a response back about this. I'd love your opinion on this.

Now I had a power outage for a few hours in-between. When power was restored, I figured I'd randomly attempt to boot my system with everything plugged in with my GTX 470. It was successful. So I decided that I'd bite the bullet and shut the system down and see if it would restart. Of course it wouldnt. Not shocked about that.

Now I switched back to my 9600GT and I get a constant beep out of my motherboard's speaker. I looked it up, after taking the annoying thing out. The error beep is a constant loud beep. According to the only chart I could find that contains this error, an IBM error chart, it states the error is either No Power, a lose card, or a short. Its obviously no power since im using the system right now. I double checked my GPU. Its perfectly in there.

So I'm down to the short. This one im not sure about. I have a molex connector for one of my fans thats has cables that are slightly lose from the connector, but they all still connect tightly to the PSU's molex. I;m wondering if there is a short in the PSU.

I'd love to know your opinions on whats up with my system.

my system specs are as followed

CPU: AMD 7750be
GPU: 9600GT
Mobo: Gigabyte AM2/2+/3
PSU: ABS Tagas BZ 700w - over a year old
Ram: Mushkin DDR2 1066 2Gb x2
HDD: 1
ODD: 2
Case: NZXT Tempest

i say trash it and get a mac haha just kidding

this is to difficult for me, i would try a different site besides this one, you know one thats more about computers instead of games

If it's not going into the POST with the card in... that's scary... Even if the card is faulty I would think that the system would still POST...

Check your card and see what it is using for power, as well as all your other devices and compare that to your PSU?

i think it actually might, i just dont have video... or else my system cant post due to massive power lose somewhere. Im thinking a capacitor blow in my PSU, which is understandable for a year old PSU. They do tend to wear down quick when you jump from using like 450w to nearly its entire output. My thing is wtf is with the beep.

Actually, the only time I had the problem you are describing, it ended out being bad RAM..

Try with just 1 stick in the system, then the other stick to rule that out

Pop open the PSU and check the caps. A blown cap (or one in the process of blowing) is very apparent.

Constant long beep = make sure you plugged the power into your 9600 when you switched. Other constant beeps are cannot find usable memory (different than 3 beeps where the first 64kb cannot be found), video card installed but not usable (same as other, different than 3 beeps where there is no card installed)

You could also be underpowering your system on the 12vt rail. Regardless of how much power the PSU can provide, it might not have enough juice along the 12vt line. Whats the amp rating on 12vt?

my PSU states each 12v should have 20a max.

The EVGA rep had me test everything disconnected but one stick of ram, my CPU, my CPU fan, and GTX 470 all at once and it posted beautifully. I sa it almost has tto be a short in the PSU as a blow capacitor is a short. lol

Modular.  12v+ 4 rails @56A (if focused)

First make 100% sure the modular feed is connected properly  (if you have messed with the cabling a lot over the year, it is  very possible the modular power connector is no longer making proper connection 100% of the time). This is the biggest problem with modular power supplies. 

On your powersupply, each rail can only get a maximum of 20A.  This is why I said focused above (adding them together) remember tho, 4x20A DNE 80 AMPs.  I will assume you are using 1 rail for the CPU, 1 for harddrives/cdrom, and one for the video card?

Ill add this: When using multiple rails, the maximum value is ONLY ever obtained if that is the only rail being used.  1 rail = 20A max.  2 rail = 28A max.  3....4 = 56A.  Undernearth where it shows 20A value for each rail on your PSU it shows 56A max (this means 14A MAX per rail if all 4 are being used).  You are probably underpowering the card on the 12V line (pulling to much power could have been why your powersupply "Shorted" if it does have a blown cap)

Edit 2:  Most 470s I can find require 220W (18.33333Ax12v) which is more than your supply can handle per rail unless they are focused.

Ok, interesting. So my PSU virtually took a dump them due to over stressing the rails. Makes sense.

A guy on Bit-tech is thinking its the mobo because the GPU sits on top of the southbridge meaning the south bridge could have went. I find this also a plausible theory. What do you think?

Its always possible, but highly unlikely.   Id just replace the PSU (you will have to either way for the GTX470, and try to find one with a single rail @60A or so) and try it that way.  Was the card physically touching the SBCS, or just its passive heatshink?  If I was a betting man, my money would be squarely on the PSU.  Tho it is very possible you shorted the board trying to get that monstrosity known as a GTX 470 in the machine (bent it a bit much if the mounting screws are to tight, etc).