03 protege clock problem

my father just had the battery replaced on his 03 protege. when he starts the car now, the numbers on the clock don't come up clearly, however it usually clears up after the car has been on for about 10 minutes. any ideas what is causing this and how to fix it?

I'd say you have a loose wire somewhere. There is a wire that runs to the clock from the battery, sometimes it's attached directly to the end of the battery cable. Check here first.