My monitor is fuzzy in internet - Samsung SyncMaster 2333SW 23" LCD Monitor

If your monitor goes fuzzy or displays distorted images after the unit warms up, it could be caused by a few different issues. Some possible causes include:

1. Overheating: If the monitor is overheating, it may cause the image to become distorted. This could be caused by a malfunctioning fan or a build-up of dust and debris inside the monitor.
2. Loose connections: If the connections between the monitor and the computer are loose, it can cause the image to become distorted. Make sure that all cables are securely connected.
3. Damaged components: If the monitor's components are damaged, it can cause the image to become distorted. This could be caused by a power surge, physical damage or age.
4. Driver or Software issues: Your monitor could be working perfectly fine but the problem may be with the driver or software. Make sure you have the latest drivers installed and try to update your graphics card driver

It's best to try to troubleshoot the issue by checking for any loose connections or cleaning the monitor to eliminate overheating as a cause. If the issue persists, it may be best to take it to a professional for further diagnosis.

Does the brightness and/or contrast ratio change when the display goes "fuzzy?"

Try moving cables around, may be too close to, another, power source. Plugs may be loose tighten.

Try another known good working monitor on your computer, if the screen looks good then you know the monitor is bad. If the known good working monitor looks fuzzy as well then you know the video card is bad on it and would need to be replaced.

Sorry but i was not sure you were on same pc.

Go into monitor controls on monitor and adjust as they come up. Unhook monitor, power up computer, cut off, plug in monitor power up computer, right click on screen, settings, adjust for screen size and additional monitor by clicking 2 and saying yes in box. Hope this helps.

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An unusual problem for a flat screen monitor.
I suggest you connect the monitor to another PC to see if the problem persists since it could also be caused by the video card (or circuit, if on board).
Check your cables making sure they are solidly connected and wiggle them to see if you can cause the problem to come or go away; this would crudely check the shielding of them.
This kind of aberration could easily happen with a conventional CRT monitor if power supply filtering was failing but as mentioned, uncommon in a monitor that is essentially digital.    

I also have an Asrock motherboard (M266A) and have the AL2216W. The image and text is also fuzzy. I did improve it a by by unplugging/replugging all of the connectors on the back of the computer. I believe my mouse had a somewhat loose connection and this was causing interference. I can actually create interference on screen by moving my mouse up and down.
These Acer monitors seem to be very sensitive. I also tried this monitor on a old Desktop with Win98 and another new laptop with XP and it looks good on those computers, but not on my Asrock based system.

get it checked that a problem with the monitor also check it on another monitor if you can