VGA Splitter issue

Hi there, new to this forum and am after some guidance. ..
I have recently purchased a Mac Mini and wanted to connect it to two displays, one standard monitor and one LCD TV in the next room via a 5m VGA cable. I purchased a powered VGA splitter and relevant VGA cabling and it worked to the monitor and to my Samsung 40" LCD TV via the VGA port and got really good resolution.
I have subsequently replaced the Samsung TV with a Sony 40" KDL-40V4000 LCD TV which also has a VGA port. With exactly the same setup I get flickering horizontal lines lines on both the TV and the monitor.
I have subsequently discovered that if I remove one of the displays from the splitter the remaining one works fine.
I have now purchased a VGA switch and even switching between the two I get the flicker.
I have been through the TV settings and played with SwitchResX to no avail
Any suggestions would be appreciated
Thanks

David,
Many thanks for the reply and sorry about my delayed response.
I currently have the resolution set to 1280 x 768, 60Hz.
I have tried a number of resolutions that work fine, mainly at 60Hz.
The Sony LCD supports this resolution according to the manual.
The monitor is an Acer AL2016W which supports up to 1680 x 1050 which is it's native resolution.
I have now tried every possible configuration of VGA cable. The length does seem to have an impact in that the longest cable is worst affected and the shortest is a feint flicker. If the lengths are about the same however there is a similar flicker on each.
Again, any suggestions would be much appreciated
Thanks
Whiteee

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