Display repeatedly sleeps and wakes - Geforce FX 5200 DVI

Hi There
I own a G4 powermac Quicksilver (733MHz) 10.4.11.
For a long time I have been using an old mitsubishi 17" monitor alongside my powermacs standard 32mb VGA graphics card.
Recently I decided to buy a 20" Apple Cinema Display and a new Nvidia GeForce FX5200 256mb (DVI and VGA) graphics card which would apparently work with my g4 and the display.
I installed the graphics card firstly using it with my VGA monitor and everything appeared to work fine. I later tried it with my new apple display and everything was working at first but after about a minute of being on the display started repeatedly sleeping and waking constantly.
Now this is all that happens when I turn on my g4.
I thought it could possibly be a driver issue but I don't no were to look?
Does anyone have any ideas what I could do?
Thanks
Freddie

Yes, I am sure it's the same hardware (unless someone snuck into my office and made a switch) Musta been a full moon or something but at least I have a witness.
So what would be the cheapest VC upgrade that would permanantly reinstate the rotation.
Thanks for your imput

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    Sleep Cause: 5 is normal system sleep initiated by Energy Saver. Grep "wake reason". It will result in extracting additional helpful log entries.
    There are numerous causes for the system to wake periodically but obviously its Internet connection should not be lost upon waking, and it should not be required for you to disconnect / reconnect the Thunderbolt to Ethernet connector to reestablish connection. The usual first step in resolving a problem such as that would be an SMC reset. Try that, followed by an NVRAM reset according to the instructions below.
    It may have no effect on the problem but it's the first thing AppleCare would have you do, so you might as well try it before resorting to calling them.
    Power or other problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset. Read all the steps.
    Before Resetting the SMC
    Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
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