IBM 7985 Problem Determination And Service Manual

Table 2 describes the function of the jumpers on the system board.Table 2. System Board JumpersJumpernumber Jumper descriptionJ33 Wake on LAN: The default position is pins 1 and 2. Change the position of this jumper to pins 2 and3 to prevent a Wake on LAN packet from waking the system when the system is in the power-offstate.J35 BIOS recovery: The default position is pins 1 and 2 (use the primary page during startup). Move thejumper to pins 2 and 3 to use the secondary page during startup (see “Recovering the BIOS code” onpage 67 for additional information about BIOS recovery mode).J37 Power-on password: The default position is pins 1 and 2. Changing the position of this jumper topins 2 and 3 bypasses the power-on password check the next time the server is turned on and startsthe Configuration/Setup Utility so that you can change or delete the power-on password.Changing the position of this jumper does not affect the administrator password check if anadministrator password is set. If you forget the administrator password, you must replace the systemboard.Notes:1. Before moving any jumpers, turn off the server; then, disconnect all power cordsand external cables. (Review the information in “Safety” on page vii, “Installationguidelines” on page 105, and “Handling static-sensitive devices” on page 107.)2. Any system-board jumper blocks that are not shown in the illustrations in thisdocument are reserved.16 IBM System x3655 Type 7985 and 7943: Problem Determination and Service Guide