Configuration Variable Commands Configuration variables are stored in non-volatile memory so their values persist across power-cycles. printenv variable If variable is given, show its current value. Otherwise show all configuration variables and their current and default values. Because Startup Items and Login Items are disabled in Safe Mode and certain features are turned off, such as native display drivers, advanced Wi-Fi and file sharing, some apps might not work correctly in Safe Mode. If intermediate node names are omitted in a pathname, Open Firmware will do. diag-file, empty string, File from which to boot in diagnostic mode. local-mac- address? false, If true, network drivers use their own MAC address, not system s. Most people will just need to use the Reinstall Mac OS X option here, but there are many other tools you can benefit from. If the Recovery Mode files on your Mac are damaged or unavailable, your Mac will automatically download them from Apple so. A stack diagram such as (n1 n2 - n3) or (adr len -) or (-) shows a command's stack effect. Items before the - must be present on the stack before the command executes; the command uses them and removes them from the stack. Screen-#columns 80 Number of on-screen columns (characters/line). screen-#rows system-specific, e.g. 30 Number of on-screen rows (lines). scsi-initiator-id 7 SCSI bus address of host adapter, range 0-7. security-#badlogins no default Number of incorrect security password attempts. Is true test net - test the network connection test-all device-specifier Test all devices (that have a built-in self-test method) below the specified node. (If device-specifier is absent, the root node is used.) watch-clock Test the clock function. All Startup Items and Login Items are loaded normally in Verbose Mode, as are required kernel extensions, user-installed fonts, drivers and so forth. When to boot in Verbose Mode. Some of the situations that warrant booting into Verbose Mode include: If youre a developer If. Verbose Mode didnt solve my issue Your next best bet is Safe Mode. Learn how, when and why you should use OS Xs Safe Mode in this how-to. Booting your Mac in Safe Mode loads only essential OS X items, helping isolate any software problems. Oem-banner empty string Custom OEM banner (enabled by oem-banner? true). oem-banner? false If true, use custom OEM banner. output-device screen Power-on output device (usually screen, ttya, or ttyb). pci-probe-list system-specific, e.g. 0,1,2,3 Which PCI slots are probed and in what order. Input-device keyboard Power-on input device (usually keyboard or com1 ). local-mac-address? false If true, network drivers use their own MAC address, not systems. mfg-switch? false If true, repeat system self-tests until interrupted. nvramrc empty string Contents of NVRAMRC script. Step 1: Navigate to your Macs Applications Utilities folder and open the Terminal application. Alternatively, click the Spotlight icon in the menu bar and search for terminal. Step 1: Type the following command into the Terminal window and hit Return. If youve already enabled a firmware password, you can remove it from here. Use Network Tools to Troubleshoot Your Connection. Select Utilities Network Utility to open a network diagnostic tool. This utility provides a graphical way to view your network connection information. Mar 18, 2010. You will be welcomed with a open firmware prompt. To then boot a. Many older. Apple monitors used a 640x480 67Hz mode. If your video.