Failure to boot Sever already active for display 0

[Neil]

Hi
  Since installing the latest Ubuntu 10.04 kernel I can only boot
through failsafex

I get
Fatal server error: Sever already active for display 0

Then it advises me to remove tmp/.x0-lock  which I did

also says

(WW) xf86 CloseConsole KDSETMODE  failed: Bad file descriptor
(WW) xf86 CloseConsole VT_GETMODE  failed: Bad file descriptor
(WW) xf86 CloseConsole VT_GETSTATE  failed: Bad file descriptor

Any ideas would be appreciated

Neil