The most common cause of what you describe is a failing backlight driver board. You should be able to get and fit a replacement fairly easily!
Having said that, it's not the only possible cause. If you have and know how to use a digital volt meter then you could do some testing to narrow things down.
Rik from RCE
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if you should need any help with testing the monitor, let me know!
Rik from RCE
Nearly a Posting Maven
2,335 posts since May 2009
Reputation Points: 127
Solved Threads: 199
Rik from RCE
Nearly a Posting Maven
2,335 posts since May 2009
Reputation Points: 127
Solved Threads: 199