17" display fragments, jitters etc

I have a recurring problem with my 17" Apple Studio display that I'm running on an older G4 Tower. The display starts to fragment, jitter, etc. as I am using it. It seems to happen more when it has been running for some time, esp. when it goes to sleep for hours and I awaken it. If I safe boot it, problem goes away (extention perhaps?) but if I normal boot it, problem recurrs. Eventually it goes away, but no pattern has developed yet. Friend thinks I need a new VGA (?) or video card (I'm a total novice with this stuff). Any ideas or advice GREATLY appreciated.

my new (2 months) 17" iMac display has suddenly gone
dim and will not return to normal brightness. Check
other postings but didn't seem to fit or answer my
problem. I have tried all the preference settings,
etc and even "unchecked" the dim before shutdown
option. Everything was working fine last night, then
turned on unit this morning and thought I was having
vision problems because it seemed so dark but
realized the display seems to have gone to permanent
dim mode.
Follow-up:
OK, I feel so stupid I won't go into all the details but figured out someone had messed with f14 and I didn't think to actually check the brightness control on the keyboard. I'm a new MAC user but am loving it more and more as I use it. I'm still learning a few of the "ins & outs" since moving over from the dark side.

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