X240 VGA connection to TV shows wrong resolution

Hello,
I recently migrated Win8.1 from X240 HDD to SSD, and replaced the stock HDD with the SSD. I managed to reset the system to the original Win8 factory settings, and updated through Windows update to Windows 8.1. I also used Intel Driver Utility 2.0 to update drivers. So far everything goes well, except for when I connect my X240 with VGA port to my TV. The resolution of my Sony Bravia TV is HD ready (720p), whereas my X240 display is Full HD. When I had my X240 running on HDD, connecting to my TV through VGA port went smooth out of the box. No resolution issues whatsoever, I got a screen-filling display.
I guess it must have something to do with drivers, but I'm not so driver-savvy. What driver would be involved in this (VGA port)?
Thanks in advance!

Hi - Update for anyone that is interested. I've had a play around...
I went into System Preferences/Display and connected the TV.
The resolution still changed but I went to 'Arrangement' and deselected 'Mirror Displays' (10.5.7 to thank for that) My screen on the MacBook returned to its normal resolution but the TV was still not working.
I selected 'Display' and then 'Gather Windows' and on the TV's Display changed the resolution to 1600x1024 instead of the one 10.5.7 assigned.
Bingo! It's all back up and running!
Wish I didn't have to spend 20 mins on the phone to Apple though with no solution - that'll be added to my student phone bill! ARGH!

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