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While you can run the necessary software in a fully-booted system, I recommend doing testing in Single User Mode where there are far less programs loaded in memory, and less chance of an important system component getting corrupted if your machine freezes or kernel panics - common symptoms of bad memory. If you’ve purchased AppleCare for your Mac, it comes with a bootable TechTool Deluxe disc, but you’re otherwise left to your own devices when it comes to hardware tests.įortunately, with a little preparation right now, you can boot your Mac into Single User Mode and do a complete RAM test in the future. While off-the-shelf PCs can run a copy of the free Ultimate Boot CD tool to perform RAM tests, Macs are a little bit more complicated in this respect. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.Whenever I get a new stick of RAM for my Mac or PC, I’m always eager to just plug it in and start using it to its fullest, but having worked on hundreds of computers and encountering dozens of bad memory modules has convinced me that thorough testing is a must. If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. Wait until the operation completes, then quit DU and return to the installer. If no errors are reported click on the Repair Permissions button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If it does not say "Verified" then the hard drive is failing or failed. In the DU status area you will see an entry for the S.M.A.R.T. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. When the menu bar appears select Disk Utility from the Utilities menu. After the installer loads select your language and click on the Continue button. Boot from your Snow Leopard DVD in order to quickly determine if the drive is bad:īoot from your Snow Leopard Installer disc.