astra starting problem

[dmc85]

Hello all.
I went to start up my 99 1.8 astra yesterday after it had been resting for about a week and there were some problems.
I turned the ignition and it began to crank but then stopped, no big bang or anything. Turned the key again and got only a whirring noise, but the engine was not cranking. I opened the bonnet and tried again, when I turn the ignition the fan belt spins.
the battery seems fine so after reading a few forums I gave the starter a few knocks with a hammer..... Nothing.
I also put the car in gear and moved it a little, no start after this.
I'm not sure where to start, starter motor? cam belt? flywheel?
your help will be appreciated!

[1598]

You can discount the immobiliser in the fob as the car will turn over and run for a second or two before dying if it is that.

Have you checked fuel lines/spark plugs are ok?