My GEM GL-1821A Computer monitor has a high pitch squeak that is intermittent in occurrence but sometimes continues for long periods of time. Got any ideas?

On eBay or Google Product Search or Amazon, search
GEM GL-822 power
or
GEM GL-822 12V 5A
There are a number available there. It is 12V DC, 5A

take your RAM out and put it back carefully

Sounds like your power supply capacitors are causing the power supply to shut down. Or you have a short in the monitor loading the power supply. You should try a different power supply.
Monitor Mike

It's on the actual monitor. It sounds like the monitor is damaged. Take it in for repair, or sometimes cheaper to just buy a new monitor.

It is probably the drum bearing going bad and yes it is okay to use but will probably sart clunking when it wheres out all the way.

if the speakers are built in try a new rca cable

Suspected the main board / invertor.

1 check whether to the correct socket jack.
2 check cable continuity.
3 vol too low setup at the cpu

at first i would have said it was the video card in your comp,
but if you have tried it on other computers then that cant be the problem.
So if we no its deffinatey not the video card then it is going to be one of two things.
the first thing is its going to be the power pack over heating thid does happen from time to time and can be resolved by replacing the power adaptor this is the cheaper sollution as long as this is the problem,
The other problem it could be is a solder problem because if the monitor comes on everytime and then switches off the chances are if it is not the power pack then it is going to be a bad solder on one of the resistors this is also a common problem with monitors and television.
Now the problem you have got is do you replace the power pack hoping it is that over heating, but if you do this and it is not this that is to fault then you have wasted your money on a power pack that you dont need but hopefully can get a refund on.
Or do you look at the other option a bad solder this is also not very expensive to repair but without knowing what your looking for and without the equipment to check the resistance and finding where the bad solder is.
If you have tried a different power pack then the problem is going to be a bad solder now you can do this yourself but could take ages to find the fault yourself and buying equipment also expensive.
If you can buy a power transformer on the basis you can take it back if this is not the problem i would try this first but make sure you can get refund if it makes no difference.
If you have the equipment to do it yourself and you know aht you are looking for then this should be inexpensive just the price of some solder aslong as you have all equipment if you dont then take to repair shop tell them the problem and they should fix this for a small fee would be alot cheaper than replacing the monitor let me know what you want to do.
If you are capable of doing this yourslef you will need spec sheet but not having an idea what you are looking for will mean you wont find the problem and alot of people totally destroy the unit trying to repair themselves let me know

- lower resolution on computer ti 800 x 600 - look on screen to see faint image, if so, then inverter or backlight is gone.