- Keep your iBoot disc: If booting from your hard disk should fail for whatever reason, you can always boot again from your iBoot disc to get into your system. Booting from iBoot loads a vanilla set of barebones extensions that should work in most cases. Once you're back in, you can run MultiBeast as many times as you need to fix the problem.
- Software updates: The great thing about the MultiBeast install is that OS X's Software Update works just like it does on an Apple Mac. But before installing an OS X system update, it's a good idea to check out tonymac's site to see if anything has changed. There's always a chance that a new update could do something funky. Since building mine though, I've updated from 10.6.6 to 10.6.7 without a hitch.
- 64-bit?: On the tonymac forums, you'll find a lot of folks talking about whether to run a full 64-bit version of the kernel (the core system software) or the default 32-bit kernel. I'd explain what that means, but it's probably not even worth it. All you need to know is that it may sound like 64-bit is the much speedier way to go, but for 99 percent of folks (me included), Apple's 32-bit kernel is just fine. The cool thing about OS X is that 64-bit apps like Photoshop will run in full 64-bit mode even when you're running a 32-bit kernel. And a 64-bit kernel can cause all kinds of problems with older devices and other apps that may not have 64-bit support. So you can cross that obsession off your list.
- /Extra/Extensions: Keep an eye on this folder to see everything that MultiBeast installs on your system. Also, keep it backed up so you can roll it back should anything go haywire. Reverting to a snapshot of this folder's contents when things were running smoothly is a great troubleshooting technique.
- Updating MultiBeast?: MultiBeast is updated fairly frequently to include additional support for the latest hardware components. Technically speaking, it's a cinch to update individual components from within MultiBeast (I just recently updated to the new Chimera bootloader, which had better support for my graphics card). But if you don't have any specific complaints with your system, I'd leave things as-is. When I updated the bootloader, somehow my /Extra/Extensions folder was wiped clean. It took me a while to figure that out and get things back to normal. So if it's not broken, don't fix it! (unless you're willing to troubleshoot new issues).
- Unplug stuff: USB devices (or combinations of USB devices) can sometimes complicate things. If your system is behaving badly and you can't figure out why, unplug all your USB gadgets and add them back one at a time to see if you can find the culprit.