IBM 7985 Problem Determination And Service Manual

v Make sure that the device drivers on the client and server are using the sameprotocol.If the Ethernet controller still cannot connect to the network but the hardwareappears to be working, the network administrator must investigate other possiblecauses of the error.Solving undetermined problemsIf the diagnostic tests did not diagnose the failure or if the server is inoperative, usethe information in this section.If you suspect that a software problem is causing failures (continuous orintermittent), see “Software problems” on page 48.Damaged data in CMOS memory or damaged BIOS code can cause undeterminedproblems. To reset the CMOS data, use the password override jumper to overridethe power-on password and clear the CMOS memory, see “System-board jumpers”on page 15. If you suspect that the BIOS code is damaged, see “Recovering theBIOS code” on page 67.Check the LEDs on all the power supplies (see “Power-supply LEDs” on page 53).If the LEDs indicate that the power supplies are working correctly, complete thefollowing steps:1. Turn off the server.2. Make sure that the server is cabled correctly.3. Remove or disconnect the following devices, one at a time, until you find thefailure. Turn on the server and reconfigure it each time.v Any external devices.v Surge-suppressor device (on the server).v Modem, printer, mouse, and non-IBM devices.v Each adapter.v Hard disk drives.v Memory modules. The minimum configuration requirement is 1 GB (two 512MB DIMM, in DIMM slots 1 and 2).v Service processor (Remote Supervisor Adapter II SlimLine).The following minimum configuration is required for the server to start:v One microprocessorv Two 512 MB DIMMsv One power supplyv Power backplanev Power cordv ServeRAID SAS controller4. Turn on the server. If the problem remains, suspect the following components inthe following order:a. Power backplaneb. Memory card (DIMM)c. System boardIf the problem is solved when you remove an adapter from the server but theproblem recurs when you reinstall the same adapter, suspect the adapter; if theproblem recurs when you replace the adapter with a different one, suspect the risercard.Chapter 3. Diagnostics 89