Urgent Help when starting up background keeps flashing to grey and has no dock/menu at the bottom
Sometimes when I start my macbook the background flashes from the one I've picked to a grey one and there is no dock at the bottom. Normally I restart my computer and that seems load it as normal however it seems to becoming a regular occurrence and I end up restarting my mac several times before it does back to normal. How do I fix the problem?
Thanks
MacBook Pro, Mac OS X (10.6.8)