␡
- Disassembly Overview
- Electrostatic Discharge (ESD)
- EMI (Electromagnetic Interference)
- Disassembly
- Tools
- Opening the Case
- Cables and Connectors
- Storage Devices
- Motherboards
- Mobile Device Issues
- Reassembly
- Preventive Maintenance
- Basic Electronics Overview
- Electronics Terms
- Power Supply Overview
- Power Supply Form Factors
- Purposes of a Power Supply
- Power Supply Voltages
- Mobile Device Travel and Storage
- Mobile Device Power
- ACPI (Advanced Configuration and Power Interface)
- Replacing or Upgrading a Power Supply
- Symptoms of Power Supply Problems
- Solving Power Supply Problems
- Adverse Power Conditions
- Adverse Power Protection
- Surge Protectors
- Line Conditioners
- Uninterruptible Power Supply (UPS)
- Standby Power Supply (SPS)
- Phone Line Isolator
- Electrical Fires
- Computer Disposal/Recycling
- Soft Skills?Written Communications Skills
- Chapter Summary
- Key Terms
- Review Questions
- Exercises
- Activities
This chapter is from the book
Symptoms of Power Supply Problems
The following is a list of symptoms of a power supply problem:
- The power light is off and/or the device won’t turn on.
- The power supply fan does not turn when the computer is powered on.
- The computer sounds a continuous beep. (This could also be a bad motherboard or a stuck key on the keyboard.)
- When the computer powers on, it does not beep at all. (This could also be a bad motherboard.)
- When the computer powers on, it sounds repeating short beeps. (This could also be a bad motherboard.)
- During POST, a 02X or parity POST error code appears (where X is any number); one of the POST checks is a power good signal from the power supply; a 021, 022, . . . error message indicates that the power supply did not pass the POST test.
- The computer reboots or powers down without warning.
- The power supply fan is noisy.
- The power supply is too hot to touch.
- The computer emits a burning smell.
- The power supply fan spins, but there is no power to other devices.
- The monitor has power light, but nothing appears on the monitor, and no PC power light illuminates.