Power Supply Problems; Post Error Codes - Lenovo IdeaCentre B305 Hardware Maintenance Manual

Hardware Maintenance Manual

Power Supply Problems

POST error codes

22
Error
The boot sector on the start-up
drive is corrupted.
The drive is defective.
If you suspect a power problem, use the following procedures.
Check/Verify
Check the following for proper
installation.
• Power Cord
• On/Off Switch connector
• On/Off Switch Power Supply
connector
• System Board Power Supply
connectors
• Microprocessor(s) connection
Check the power cord for continuity. Power Cord
Check the power-on switch for
continuity.
Each time you power-on the system, it performs a series of tests that
check the operation of the system and some options. This series of tests is
called the Power-On Self-Test, or POST. POST does the following operations.
• Checks some basic system-board operations
• Checks the memory operation
• Starts the video operation
• Verifies that the boot drive is working
If the POST detects a problem, an error message appears on the screen. A
single problem can cause several error messages to appear. When you correct
the cause of the first error message, the other error messages probably will
not appear on the screen the next time you turn on the system.
FRU/Action
The drive must be formatted do the
following:
1. Attempt to back-up the data on
the failing hard disk drive.
2. Using the operating systems
programs format the hard disk
drive.
Replace the hard disk drive.
FRU/Action
Reseat connectors
Power-on Switch