XFX 8800GTX bootup issues

Hello to all you Tom's forum fans and users.... I have a problem that maybe you can help me out with.

I own a XFX 8800GTX graphics card for more then a year now, but about a month ago something strange started to happen.

It all started when I moved my computer to another room for better Wi-Fi reception. When I turned the computer back on I saw to my disbelief that my computer wasn't booting up, so I tried again but still no luck. What would happen was.....

1. When I turn on the computer the fan on my Graphics Card would go full throttle (100%)
2. No initial POST signal or beep
3. No signs of any activity of booting up in the background
4. Occasionally the system would successfully boot up in the background and a "GFX not detected POST beep" will sound .... ( 1 Long beep with 3 short beeps for the Asus P5B-Deluxe WI-FI AP )

I am pretty certain that my graphics card is causing the problem because of the throttling, so I immediately checked out the power connection to the GFX (could be a loose connection) and after removing and reconnecting the connectors the computer started working again... or so I thought.

The next day I turned on the computer.... same thing !!!

So instead of reconnecting the power connectors this time I sort of pushed on the solder joints of the connector to ensure proper contact to see what would happen. I saw that the GFX started working again. At this time I thought to myself that its has to be bad/broken solder joint.

So what I did after was, I re-soldered the joints to ensure maximum contact and it fixed the problem for about 2 days until it came back.... same situation.

A couple days later I re-solder again, which again was a temp. fix for about 2-3 days but the problem came back.

Now its so bad that even if I push down firmly on the solder joints... The computer still wont boot up ( it's sort of in the computers hands now when it will boot up. Some times it will take 10 tries until it finally starts working )

I have a couple of theories of what is causing the problem

1. A VERY bad solder joint that maybe un-repairable to a extent
2. A malfunctioning capacitor or resistor ( or maybe one with a bad solder joint ) causing power fluctuations not allowing the card to POST itself before giving the ok to the Motherboard... (you get the idea of what I mean )
3. It could be on the PSU's side where either the Motherboard is not giving a "Power OK" signal to the PSU or that the PSU cant see the "Power OK" coming from the Motherboard thus not powering up the system. ( Which I feel is not the case because if it was then symptom no. 4 stated above would not happen )

So my question is, has anyone had this issue with this GFX before ( The XFX 8800GTX ) and if so what was your solution ?

P.S
I already tried cleaning all pci and pci-x contacts of my system, memory also, even the pci slots!
Just so you know where I'm coming from, I have been working with computers for over 20 years, installing, troubleshooting, and repairing.

If you want I can post pics and a video of my problem.

And also I am posting now with the system that is causing me problems.

System Specs
--------------------------
Intel E6200 @ Stock speed
Asus P5B-Deluxe WiFi Ap
2x 1gb OCZ special ops PC6400 ram
XFX 8800GTX @ Stock speed
780W Real GreenPower PSU ( Server PSU used in Asia and the Middle east, can also be found in Europe)
4x 250gb Seagate/Maxtor H.D.D in Raid 0 array
1x LG Optical Drive
1x Floppy drive
1x WiFi network card (Atheros)

Well, I went online to register for the first time and it says that in order to have the lifetime warranty I would of have to registered within 30 days of buying it ( which I didnt because I didn't know about that and it didn't say anything on the box I believe ) and that I didn't buy this card from the U.S., I actually bought it from the middle east at the time that the computer convention was in Dubai ( forgot the name ). So I was wondering if this would present a problem and, what can I do to get around this problem?

Thank you