Screensaver is stuck on

I tried to boot-up my powerbook tonight and it looks like the screensaver is on. When I hit a button to wake it up it does nothing. When I restart it I hear the startup sound but the screen just looks like a screensaver. I spoke to apple and they tell my I have to send it in for repair but when I tried to get that done they tell me I have to show proof of the purchase date before they will warranty it. Even though I purchased it from Apple's website. Only problem is the department is closed until Monday.

Any suggestions?

Thanks
Mike