Upgraded to osx lion via bootable USB stick but start up now just hangs on the grey apple screen

Hi.  I've just recently upgraded from snow leopard to osx lion 10.7.3 on my laptop and it works perfectly! However I then tried installing on desktop and problems......
1. I got the 'the error can't install message' so after researching' I made a bootable USB stick with lion on it.
2. Installed on start up from bootable USB stick, no problems their.
3. Restarted and it just hangs in the grey apple screen.
I've reset the PRAM, started in safe mode, fixed disk permission etc, Even done this (http://hints.macworld.com/article.php?story=20070204093925888).
I'm going to leave the grey screen over night to see if it does start up, but then we have the problem of an extremely slow start up.
So.... I am posting this to find out if anyone else has this problem and fixed it without having to do a full clean install as some data like email lists etc I never backed up (I know stupid).
Hope someone can help as i am lost on what else to try.
HELP!?!?!?
Dan.

Update 01.03.12
Computer is starting now but.... It takes 10 minutes and that is without my sound card, hardware and external hard drives plugged in, gonna test that now.
Are their and fixes for slow start ups?
Dan.

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