1997 SAAB 900 SAAB 1997 900 won't start up

So the drive belt (fan belt) had to get replaced so I was driving to the store to buy a new one and on my screen it stated that the coolant was low so I was going to buy that too. As I was trying to park my car just shuts off me. It was a noise coming from the front hood. The car will spark but nothing would happen the radio will go on and off and the windows wont go up or down. So I brought a new belt and coolant so I placed some coolant in the coolant tank and tired to start it but nothing happened the same thing kept on happening the radio will go on and off the windows wont go up or down the dash board light swill come on I have gas in my car. Can someone please help me out.