The injector "driver" is a transistor chip that cycles power on and off to the fuel injector. They can often burn out if someone uses an injector with the wrong impedance (electrical resistance to cycling, alternating current-type signals). I can't recall if the AEM requires high or low-z (z = impedance) injectors, but if it needs high impedance fuel injectors that have a high electrical resistance and someone used low-z injectors with low electrical resistance the injector driver's transistor chip would overheat and burn out.
If the computer came with fuel injectors it's also possible one of them is bad. I'd start with that and have them tested and see if they work. If the injectors are good you might see if AEM can service their computer and check if it works before taking the time to install. If they don't offer any repair services you might want to find an electrics technician that can open the case and test if the transistors are good.
Eric H. - '04 Neon SRT-4 (eBlue/S2) - '92 Dodge Daytona IROC R/T
'91 Dodge Spirit R/T - '19 Pacifica Hybrid Limited - '14 CTS-V Wagon
'08 Cobalt SS Turbo - '14 Cruze Turbo Diesel - '02 SVT Focus (S/C)
'04 SVT Focus (EAP) - '07 Ram 1500 - '81 & '85 Chevy Citation X-11
'90 Pontiac Turbo Gran Prix (ASC/McLaren) - '93 Olds Achieva SCX W41