OK, so this is a re-post as i've posted it in the Mac forum. Mods feel free to dish out a sound spanking, bit this problem's getting on my boobs.

Right, my daughter purchased this second hand iMac. Trouble is it doesn't boot to either a log-in screen or desktop. What I get is first this

and then this

which is where it stops. The hands on the little watch icon don't move, the mouse is active, but thiat is all there is. Tried leaving it for an hour or so, but nowt. Any ideas peeps? I'm a Mac n00b

I just know it's going to be obvious
It's a Bondi Blue G3 350Mhz/512 Model M5521