If it was the bolt for the grounding strap that seemed to make the difference, remove the bolt and clean it and the threads in the body as well as you can. I added a star washer under the strap to be able to bite through the paint for a better ground. Add some dielectric grease before putting it back together. See if the problem stays away after that.
If not, then the ignition switch is a possibility. GM has issued a TSB for it.
Bulletin No.: 00-08-49-015
Date: November, 2000
Intermittent No Start/No Crank
(Replace Ignition & Start Switch Assembly)
2001 Oldsmobile Aurora
2000-2001 Pontiac Bonneville
Some customers may comment that the ignition and start switch assembly in the above listed vehicles may not operate properly resulting in an intermittent no start/no crank condition.
This condition may be due to plastic particles interfering with the electrical contacts of the ignition switch assembly.
An improved ignition switch assembly, P/N 25721650, is now available from GMSPO.
We're here to help - so, post whatever problems you have and we'll do our best to help.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.