Lenovo ThinkCentre A52 Hardware Maintenance Manual page 51

1. Are the exact machine type and models
2. Have the same BIOS level
3. Have the same adapters/attachments in the same locations
4. Have the same address jumpers/terminators/cabling
5. Have the same software versions and levels
6. Have the same Diagnostics Diskette (version)
7. Have the same configuration options set in the system
8. Have the same setup for the operation system control files
Comparing the configuration and software set-up between "working and
non-working" systems will often lead to problem resolution.
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Chapter 4. General Checkout