KT4 Ultra - Monitor shuts off

Hey guys...i posted a while back with my problem regarding errors within windows, even after reformatting, and also it just randomly powering down..i solved those errors by replacing the memory chip and also replacing the HSF as the proc. was running rather hot...now, however, i'm faced with another problem...I'm using the PC and then all of a sudden the screen goes blank, says its not recieving a signal...so it seems the Vid.Card is just shutting down and not outputting anything..and it happens randomly, just during regular use, not gaming or anything, so i highly doubt the vid card is overheating...i then have to do a cold reboot and the screen works again for another 10 minutes or so and then just goes blank..its gotten to the point where the computer is barely usable with this screen problem so does anyone know what or have any ideas on what i could do to rectify this? Thanks!
COMP. Specs:
MSI KT4 Ultra - Athlon XP 2200+
256mb Ram
64mb GeForce4 MX440 8xAGP
300W Allied Power Supply
WD 60gb hdd
Thanks!

yep, i surely tested the cpu temps and memory and it was working without a hitch, now this monitor issue came into play...the monitor is rather old, could it just be shot? the PSU AMPS to the rails are as follows "Output: +3.3V@28A;+5V@30A;[email protected];+12V@15A;[email protected];+5VSB@2A". Is that my weakness? or perhaps the vid card is just dying? What is most probable? Thanks for the help!

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