Xerox 4540 Service Manual - Page 200

B.2 How to Load Optimal Default Settings During BIOS/POST 1. Press F2 to invoke Setup. After some screen messages, the BIOS setup utility appears. 2. Press F9, or use the arrow keys to scroll to the Exit -> Load Optimal Defaults. A dialog box asks "Load Optimal Defaults [OK]." 3. Press Enter. The dialog box closes. 4. Press F10 or use the arrow keys to scroll to Exit -> Save Changes and Exit. A dialog asks if you want to save your changes and exit. 5. Press Enter to save your changes and exit the BIOS utility. B.3 How BIOS POST Memory Testing Works The BIOS POST memory testing is performed as follows: 1. The first megabyte of DRAM is tested by the BIOS before the BIOS code is shadowed (that is, copied from ROM to DRAM) and executed. 2. Once the code is executing in DRAM, the BIOS performs a simple memory test (a write/read of every location with the pattern 55aa55aa). Note - This memory test is performed only if Quick Boot is not enabled from the Boot Settings Configuration screen. Enabling Quick Boot causes the BIOS to skip the memory test. See Section B.5, "Changing POST Options" on page B-4 for more information. Note - Because the Sun Fire X4500/X4540 server can contain up to 32 GB of memory, the memory test can take several minutes. You cancel POST testing by pressing any key. B-2 Sun Fire X4500/X4540 Server Service Manual • May 2010