I AM LOOKING FOR A NEW RADIO WITH USB TO MY ALERO 2002 3400CC, WHICH ONE IS SUITABLE TO THIS CAR?

Depending on the radio option for your car, the radio may be locked to the VIN number of the car, or by code entered into the radio (see your vehicle's user manual). If it is locked by code, you must have the code that was previously set. If it is by VIN, only a GM dealer can do that for you.

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try youtube it might be there also do a google search

Maybe blew up a fuse while connecting or make sure that yellow wire is getting power the one for the memory or connect both red and yellow together some times if the yellow is not getting power unit won't turn on

hot to the battery

This are pretty sound vehicles overall.Would suggest taking it to a shop for inspection so you will know what it may need at this point.Depending on what is needed and costs you may be able to leverage the seller for a better deal.

do you have a best buy around they do a good job installing and you can choose what type radio you want ,walmart sells kits for radios so that you can install them urself

IF YOU CHANGE RADIO.BY IT BEING PROGRAM TO PCM.YOU PROBABLY GOING TO HAVE STARTING PROBLEMS.THE THEFT MODE KICK IN.PCM WILL NOT RECOGNIZE NEW RADIO.THE PCM WILL NOT LET CAR CRANK.IT THINKS IT THEFT.

the make an attachment that converts the size. is your car equipped with steering controls for the radio? the new radio may not be able to be controlled from the steering wheel, thats all

Turn off the car before pulling out a fuse. Find the two fuse boxes in the passenger compartment of your Oldsmobile Alero. One is on the driver's side and the other is on the passenger's side of the instrument panel.
Consult your owner's manual to find the location of the fuse you need to change. You can also find this information on the inside of the fuse box cover.

Locate the blown fuse. If it's a radio fuse in a 2000 Oldsmobile Alero, you'd find it in the slot marked "Radio Batt" in the fuse box on the passenger's side. Use the fuse puller inside of the fuse box to remove the fuse.

Check the inside wire of the fuse. A blown fuse has a burned or broken wire.

Put in a new fuse with the same rating. Verify the fuse rating against what's listed on the fuse box or owner's manual for the particular model and year in question. Click it into place and close the fuse cover. Restart you car and verify you've corrected the problem.

If the radio calls for a code: If you bought the car new then there should be writen in the manual the code for the theft lock system on the radio. Pre-owned then it might ,might not be in there. or if you don't have one at all. 
Go to your nearest GM dealer and have them fix it by finding the code using the Vin #. Make sure to have them write it down for you in case this happens again. 

Good luck and hope this helps