[2.0][Booting problem] Phone won't turn on
I jailbroke and unlocked my first gen iphone last night and now it won't turn on. It was working fine and was rebooted a few times without any trouble. Last night I synced it with iTunes (which took a very long time) and took it to work with me. It has been running a bit slow all morning and I thought nothing of it. A few minutes ago I rebooted it and now it won't boot.
When I try to boot it shows the pineapple with a chunk bitten out of it and then sometimes after this it shows a cartoon of a man with his hands in the air and some Cyrillic (my apologies if they aren't I am pretty ignorant in this field) letters in a text box over his head.
My questions are:
1. What is wrong with my phone
2. Is there anyway to fix it?