Vista - Logon screen blank, mouse pointer pixiedust after waking from Slee

I am running Windows Vista Ultimate 64-bit on an ASUS M2N32-SLi Deluxe
motherboard and dual NVIDIA GeForce 7950GT SLi graphics cards. Whenever I
wake up my computer from Sleep mode, the logon screen (or rather I say,
unlock screen as my computer becomes locked upon going to Sleep or
Hibernation) becomes a solid blank (or sometimes a solid green or a solid
gray). After I "blindly" type my password and hit Enter to unlock, the
desktop returns, but my mouse pointer now becomes a static pixie-dust square
(sometimes transparent, other times with a white background). Changing the
pointers on Control Panel\Mouse does nothing to restore my pointer. Also,
Sleep mode triggers a bizarre video-overlay issue on my favorite TV-playback
software, DViCO's FusionHDTV: instead of playing normal live TV broadcast,
the live video freezes and alternates between the first video frame and a
solid green at the usual NTSC 30-fps rate. (I recorded 10 seconds of the
issue with my digital camera in MPEG-1 NTSC format; it is a 2.05-MB video
file I uploaded to my Web site as http://charsetplus.tripod.com/HPIM5917.MPG
; there you'll also see the mouse pointer as a white rectangle on bottom
right, although it's actually a pixie-dust rectangle whose colored pixies
can't be replicated with the camera's low QVGA resolution.) TV recording
doesn't seem to be affected by this issue, although I noticed some recordings
suffer a 5-frame audio delay.

These problems are gone only when I restart my computer or when I wake it
from Hibernation mode. I have NVIDIA's latest ForceWare 169 graphics drivers
from their website and dated December 2007. I once had another Vista Ultimate
64-bit machine on an older ASUS A8N-SLi Premium motherboard also driving dual
GeForce 7950GT SLi cards and these Sleep mode problems did not happen (but
now that motherboard is dead).

Any wisdom or further help here?