HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 106

Tests and Error Messages Order in Which POSTs Occur Order in Which POSTs Occur The POST executes each time the system is powered on or a reset is performed. The POST process verifies the basic functionality of the system components and initializes certain system parameters. The POST starts by displaying a graphic screen of the HP PC Workstation's logo when you restart the system. If you want to view the POST details, press Esc to access the HP Summary Screen. If the POST detects an error, the screen switches to text mode and a detailed error message appears on a View System Errors screen. On this screen, the error message utility (EMU) not only displays the error diagnosis but suggests corrective action. (Refer to page 114 for a brief summary.) On the HP x2000 Workstation, the LCD status panel displays either a message, a POST code number (refer to Table 4-1), or an EMU code. Devices such as memory and newly installed hard disks are configured automatically. You don't need to confirm the change. During the POST, the system copies BIOS and other ROM data into high-speed shadow RAM. The shadow RAM is addressed at the same physical location as the original ROM in a manner that is completely transparent to applications. Therefore, shadow RAM appears to behave as very fast ROM. This technique provides faster access to the system BIOS firmware. Table 4-1 lists the POST checkpoint codes and their associated beeps. See page 101 for more details about preboot diagnostics error codes. 106 Chapter 4