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Check four 5707, two 9204, and one bel 3A slow blow fuse. Also re-solder all cap and transformer.It's quiet common on benq and Dell(benq OEM) 17 LCD. For detail google "benq 5707", sure you can found. Good luck
Strange that both should show the same symptoms
don't you think?
Have you changed anything computer wise?
Graphics card or resolution?
Screeching noise is a puzzle too.
How are they powered - internally or via a separate power supply?
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