The ignitor is the easiest culprit to check. Just put the dryer into a
heating cycle and check for 120 at the quick-disconnect. If you have
120 drop, but the ignitor isn't glowing, replace it.
All the fuses and stats can be checked as well. Here's the cheater
way: pull the wires off and connect them to eachother, bypassing each
part. You can only do this temporarily though. Don't operate a dryer
with a bypassed star or fuse.