Odds are, it is not the monitor - if you have another you can verify by hooking it up.
Chances are what ever you installed is either causing a conflict (drivers or etc) or your system has been compromised.
- Did you run any of System Mechanic's tools? (You should always back-up your system before running software as such.)
- Did you scan the file (.exe, .zip or whatever) before installing?
If you do not have Norton Utilities (WinDoctor or SystemCheck) I recommend using Spybot - it contains many useful tools for Windows (aside from the basic) which may help. Also, it is free.
You are always welcome to donate the thing to me
