Grey Screen Nightmare!

I have a 2005 Mac G-4 Power book.
I installed 'ProtectMyMac' anti-virus, then went to scan mode.
Laptop timed out and went to sleep. I woke it up this morning...
All I have now is a grey screen with a small file folder that shows the finder icon and a question mark that alternate...
Any help/info would be appreciated...
EdgeWalker

Reviews for that product are not very good. I assume that you get the same results if you restart the Mac?

That means your hard drive is broken or has major issues.