I have santa rosa 2.6 mbp with recent firmware update running Leopard 10.5.7. It seems since then MBP will not always sleep when told to via screen menu in top left, it hangs on a bluey grey screen instead of transitioning to normal black power/lights out screen for sleep mode. Only way to fix is by holding power button down.. There is an old thread about same problem but with no solid conclusions as to why so i though i would see if anyone has any new ideas as to why this is happening ?? Thanks in advance.