IMac 24 in internal screen not working - external screen is working.

The model is 2.8 GHz Intel Core 2 Duo.
4GB memory
Serial Number (system): VM826CRLZE7
Chipset Model: NVIDIA GeForce 8800 GS
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0609
Revision ID: 0x00a2
ROM Revision: 3234
The graphics card was replaced in October in the Apple Store in Barcelona. Until a couple of weeks ago it was working OK again. Now the display is blank and I can only work on the external monitor I have hooked up to it.
If I turn off the computer over night - it will work for about one or two hours then go blank again. It will come back on again occasionally now and then during the day in a random way - not connected to what I am doing with the computer.
I have zapped the PRAM
If video is available remove display-related preferences:
1. Delete the com.apple.windowserver.plist preferences located at /Library/Preferences/com.apple.windowserver.plist and ~/Library/Preferences/ByHost/com.apple.windowserver.xxxx.plist/
I also did the upgrade to 10.6.7 and it worked for a few hours after that - Longer and I thought it was fixed but no luck. The screen is blank again.
I reset the SMC
Followed the advanced trouble shooting guide at http://support.apple.com/kb/HT1573
I would have expected that the repair I had done in October would last longer than this. It cost a lot to get the job done and they kept the iMac for a month. I need a way to fix this that isn't going to cost me as I am skint now.
Please Help.

Hi,
At first my screen would go black and then sometimes come back on after an minute or half an hour. After a few days it went black and wouldn't come back on at all.
I got my replacement ATI 2600 Pro graphics card from a guy in Hong Kong on ebay.
http://cgi.ebay.co.uk/24-iMac-Early-2008-NVIDIA-GeForce-2600-PRO-Video-/17057901 1278?pt=PCCVideo_TVCards&hash=item27b74d26ce
I got an independant mac repair guy to fix it, I doubt apple would offer to do this job for you without using their parts. You could probably do it yourself if you know how to take the machine apart.
Message was edited by: andydckent

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