2000 Elantra manual trans car won't crank

While the suggested resistance check of the clutch safety switch should catch a bad switch. However it may still be bad. I had the experience on my 2001 Elantra with the same problem happening intermittently. I checked and I had the delay check the switch and it looked okay. After three more trips and having them test other things including replacing the Starter motor under warranty they just replaced the switch. No more problem until 3 years later same thing started happening. I asked them to specifically check this and they just adjusted how far the switch button stuck out for teh clutch pedal to engage it under the dash. 4 days later it happened again. I said f it or something like that and went and bought the 15 dollar switch and put it in myself. I've not had a problem since then. But then I'm just coming up to the 3 yr anniversary of that switch.
You can also just bypass the switch and remember not to crank your starter without the clutch engaged unless you want to experience what whiplash is like firsthand.
Just change the switch.

The neutral safety switch is the switch located on your clutch pedal, it activates when the clutch is down to prevent you from starting it in 1st gear and so on.