2000 avalon wont start, even with jumper cable's. What else could it be?
Does the engine spin? If not, it could be the starter motor. -- Is the fuel pump running? Is there fuel pressure? Is there spark?
Engine spin, won't spark. Full of gas.
Is there a way to bypass starter, and get it to turn over?
No spark - check the fuses first. You need power to the coils.