This is not a common problem. Grey screen when? Immediately on power up or some time later during boot?
Is the card seated properly? It helps to untwist the two locking tabs holding the motherboard down either side of the edge connector the turbonet card plugs onto.
Doubtful a power supply issue. These don't cause grey screens and a turbonet is not power hungry. I doubt the extra power required to run it would tip the scales of a flakey power supply.
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