Replying to Jeep cherokee help.

okay i have a 93 jeep cherokee 4.0l h.o. and when i go to start it first all the lights and radio will come on and when i turn the key to start it doesnt do anything, but i hear a slight sound from the fuse box i thought for a while i was going to have to buy a new starter for it.im wondering if anyone elce has had this problem before and could give me some advice.the starter will start the motor if i go directly to the starter with booster cables.