GTX 560Ti Blank Screen on Boot

Hello guys,
I purchased a MSI GTX 560Ti (Twin Frozr-II edition) 5 months back. Recently, when booting...I kept getting a "No Signal" message from the monitor. There was activity on the PC , it managed to get past the POST (beep sound) and eventually I did hear the Windows 7 login music. But the screen was still black.
After restarting the PC a couple of times, I managed to get normal display again. Shut down the PC after around 4 hours of gaming , but on the next boot I had the same black screen issue. Again , a couple of reboots later - the monitor managed to get the signal.
I even plugged the card into my friend's PC , but the same black screen problem was there too. Just for testing , I tried plugging my old Geforce 9600 GT and I got normal display on the monitor.
Well, it pretty much continued in this fashion for around 2 weeks , then the card absolutely refused to give any signal to the monitor despite countless restarts. I took the card for RMA to the service centre , and when the technician plugged it into his motherboard, the card was running fine!
Brought the card back home and plugged it into my mobo , and behold...normal display! Well, it didn't last long because the motherboard died 2 hours later.
I've given the motherboard for RMA, but I'm still concerned about the card. It was malfunctioning on my PC , didn't work on my friend's PC (the card was fully powered mind you) , but then decided to work at the RMA centre. What could possibly be wrong with it?
Here's my config :
Intel Core2Quad Q6600 (2.4 ghz)
ABIT IP-35E Motherboard
5GB DDR2 800 Ram
MSI GTX 560Ti Twin Frozr II
Corsair VX450W
1x250 GB HDD , 1x200 GB HDD
Windows 7 Ultimate Edition
I was told that the VX450W was capable of powering the GPU (and it did quite well...for 5 months). Btw , my friend's PC was running a slightly identical configuration. He had a Corsair VX450W as well.
I'm not sure if the problem is in the card itself or something else. Just to be on the safer side, I'm also going for a PSU upgrade (Corsair TX750W) when my motherboard returns from RMA.

Personally, I prefer to have a PSU with an extra 5 or 6 amps to spare on the +12v rail. The VX450 only can deliver 33A and the recommendations for a system with a 560Ti is 31A(probably a system with 2 sticks ram, ONE HDD, and one ODD). 2 extra amps is cutting it a tad close in my book. And remember, any overclock, CPU and/or the GPU will increase the number of amps needed. The TX 750 should serve very well.

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Auric wrote:
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Quote from: Fredrik on 29-October-09, 10:18:35
Hello!
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Quote from: Fredrik on 29-October-09, 10:18:35
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and8713,
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Quote from: ajaymore2909 on 12-January-15, 02:26:50
Hi,
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UPDATE
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James
Message was edited by: joudbren

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