Lenovo ThinkPad 370 Hardware Maintenance Manual - Page 138

General Checkout The diagnostic tests are intended to test only IBM products. Non-IBM products, prototype cards, or modified options can give false errors and invalid system responses. Warning: Only trained personnel should service the computer. Drives in the computer that you are servicing might have been rearranged or the drive startup sequence might have been altered. Be extremely careful during write operations such as copying, saving, or formatting. Data or programs can be destroyed if you select an incorrect drive. Perform the following procedures to complete a general checkout: 1. Power-off the computer and all external devices. 2. Check all cables and power cords for correct connection. 3. Power-on all external devices. 4. Power-on the computer. 5. Press the F1 key any time while the POST memory count is proceeding. The computer emits one short beep at the end of POST and the Easy-Setup screen appears. If this does not occur, go to "Symptom-to-FRU Index" on page 141. 6. Run the advanced diagnostics tests. For information on how to run the diagnostics tests, see "Running the Diagnostics" on page 156. For information on how to disable the password, see "Removing the Power-On Password" on page 156. 7. Find your symptom in the table in "Checkout Guide" on page 127, and then go to the appropriate page. Otherwise, see "Symptom-to-FRU Index" on page 141, and then go to "Undetermined Problems" on page 152. Memory Checkout Depending on the amount of additional memory installed by the customer, the memory size that is available for customer use appears differently. This is not a hardware problem. Consult the following table for the available memory on a system with a 4MB base memory when the customer installs different sizes of small outline dual inline memory module (SO-DIMM). SO-DIMM Installed None 4MB 8MB 16MB Total Memory 4MB 8MB 12MB 20MB Available Memory 3 712KB 7 808KB 11 904KB 20 096KB 128 IBM Mobile Systems HMM