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Hardware Maintenance Manual
Power Supply Problems
POST error codes
28
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
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
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