Well its confirmed as scrimpus has said, my power adaptor works fine with the benq. No idea where I got the idea that it wouldn't. Thanks.
The benq is running well with 0800 v3 firmware. Ripped GoW3 and uploaded it to my jasper (no dvd drive).
Things went from bad to worse with the other jtag and the sammy though.
I decided to put LT+ v2.01 on the drive instead of stock, just in case I wanted to use any burnt discs in future.
After flashing it I realised it was in fact 2.0 and not 2.01. Went to reflash it but it won't go into vendor mode.
Neither iprep or jungle flasher will touch it now.
This means I can't spoof the drive. So I decided to edit the keyvault to marry its key to the jtag (which would solve any current/future problems with AP2.5 titles).
This resulted in my console not booting anything other than Xell. No problem I thought. Flash back an older nand with the old kv, clear smc and start again. WRONG!
I've got my lpt cable out again and am rebuilding a windows xp machine (with a parallel port) so that I can start from scratch. This is what happens when you are out of the game for too long and then try and pickup where you left off.
Thanks for the help in getting me this far. My favourite jtag is doing what I need it to, so I can put the other one off indefinitely if I get sick of the sight of it.