I cannot turn the key past the first position (radio on position)

Your car has several different ignition positions. They each offer slightly different functionality.
Off: In this position, the engine is off, and so are your electronic accessories (unless the delay has not expired yet). You can still turn on lights (headlights, interior lights, etc.).
ACC: This is the accessory position. Turn the key to ACC if you want to listen to the radio, play a CD or use other accessories without cranking the engine.
On: In this position, all of the electronics should come on. This is also the position that the key will return to after cranking the engine.
Start: Turn the key to this position to crank the engine. Let go of the key when the engine is running and the key will return to the on position.

http://www.aa1car.com/library/ignition_switch_positions.jpg

I use to own a car that had an ignition that was ACC - OFF - ON - START.

Try turning your ignition one position clockwise and see if the radio turns off and the key comes out.

https://hackadaycom.files.wordpress.com/2008/08/ignition.jpg?w=450&h=338

Perhaps a bad starter?

wiggle steering wheel, step on the brakes, wiggle the shifter see if any of the safety interlocks are not working properly.

I just had this problem w/ a 2007 xc70 try this: http://www.volvoxc.com/forums/showthread.php?16222-Step-by-step-to-temporarily-mobilize-a-paralyzed-quot-stuck-key-quot-broken-switch-condition&highlight=ignition%20lock

My 2006 PT Cruiser has the same problem! When hot in the cab it won't start but after it is cool outside it starts up without missing a lick! When it is hot and you turn the key you get nothing but do have power to lights, radio, etc. weirdest thing ever and nobody knows why! We have had the ignition module replaced and have a new battery. This one has stumped everyone. Any suggestions folks?

1) Put key on the ignition and don't move it. 2) Press down the odometer reset button, and dont let go. 3) Turn the ignition to the #2 position (past the radio detent) and wait like 15 seconds, until the service light goes off.

more than likely this is the problem

Replace the ignition barrel.Good luck.

Hi there
Could be simple.
Try this. the steering wheel should turn ever so slightly to one direction if so turn the steering wheel that way and then try the key, start gently and build up on the wiggle force.
It should just be the steering lock working/not working

Change the ignition switch