Detrius, thank you so much for the link! The most Ive ever attempted is to add more RAM to my computer, so this is going to be a real challenge! But hey, I dont have a working computer now, so if my attempt fails, nothing lost, only experience gained, and if Im successful, Ive saved a lot of money over the cost of another computer. Its a win win situation!
After several failed attempts, my computer can now start up in Safe Boot mode, although it takes 10 minutes or so to start up. I can still use the browser, and although video will play just fine, there is no audio. Ive gone into System Preferences > Sound to make sure the sound is turned on, and each time I do the small speaker icon shows up at the top of the screen, but when I click on it, it disappears. Is audio disabled in Safe Mode, or is there more wrong with my computer than I originally thought