i agree , try the monitor on a difrent computer or try changing the refresh
rate . LCD monitors when they get older sometimes will start to flicker a lil
bit . This is usualy a sign that your inverter for the backlight on your
screen is getting ready to fail . if it works fine on a diffrent refrsh rate
or works fine on a diffrent computer then yer inverter or CCFL backlight
tubes are fine . If it is the backlight it may not fail completly but just
continue to flicker ,or it may just go out one day . I am not to familar with
the GEM monitors but i do know that you can usualy find replacement backlight
CCFL tubes and inverters on ebay for a decent price . As long as you have a
lil bit of technical know how and the time it can save you some money to
replace it yourself than have it repaired or buy a new monitor .