G3 freezes and monitor goes dark

I have been experiencing the following scenario with increasing frequency (at least twice yesterday, and four times today)--
The monitor will suddenly go dark, as though the system were going to sleep--except that no keyboard or mouse action will wake it up again. Sometimes it will recognize the power key followed by return or enter, and shut down. Most of the time, though, it will only recognize CmdCtrlpower key to reboot.
After forcing a reboot, the video comes back. However, I have also been noticing lately that the "Waiting for local disks" phase of startup has been taking significantly longer than before (usually flashes right by, but now stays there for probably 30 seconds or more).
Any ideas as to what might be causing these video blackouts? Might the elongated "Waiting for local disks" be a related symptom?
Thanks,
Pete

Thanks Frank,
I actually came across that same post not long after I posted this question. Guess I hadn't used the right keywords in my search to find it (or get it to stand out among all the false hits). Anyway, I followed the referenced fix procedure, and things seem to be working now. Even the prolonged "Waiting for local disks" phase has gone away since applying the fix.
Thanks again,
Pete

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