need help
 

i have a 2002 pt cruiser 2.4l i had to put a head gasket set and all new timing parts on about a month ago and now it will not start all marks are perfect and also a new coil now when turning over its not getting spark freom the coil until u let off the key ive been told its the ignition swicth then other ppl are saying its the ecm(computer) i need a lil help here i have no idea what the problem is

Any codes?