Sadala

I have called the dealership they told me ' it need to be computer program to cease security system .M.YASIRuy it's turning over but not firing up

I have a 1999 LS 400 Lexus. I bought a keyless entry from EBay I tried to program it with the car. Now the car won't crank. It didn't program and now the car won't start. Is their anyone that had this same issue and have any suggestion as to how I can get the car started or can tell me what's the problem with my car. The car turns over as if it's about to crank but it's not starting. Thank you in advance for any assistance with this matter.