Vista won't boot - just get black screen

"Since chkdsk found and ""fixed"" some errors the parition could be in a state which prevents it from booting in a way ""start-up repair"" does not recognize and thus fails to fix. You might want to try a re-format of the partition and re-install of Vista.

The fact that there was a problem on the disk in the first place might also indicate a physical probem with the disk. Most vendors have special tools on their web-site to diagnose problems with their drives beyond what windows does. If you suspect the disk, buy a new one and migrate everything on that disk (even partitions which are still fine).

There is also the possibility of a different hardware problem, e.g. motherboard, disk controller, but since Ubuntu seems to work fine this is less likely. You might still want to check your bios settings for anything unusual (which Linux might cope with but Windows does not).

Btw, can you mount the partition from Ubuntu? If yes use this to make a backup of it first :-)"

This usually happens when graphics card driver does not function properly. To get your computer working , log in safe mode and uninstall graphic card driver from device manager and reboot your computer. After you will able to login windows and Vista will automatically install the default driver for motherboard.