Acer Extensa 500 Service Manual

Troubleshooting 

Fail-Safe Timer NMI Failed

DIMM

CPU board

System board

Device Address Conflict

Run “Load Default Settings” in BIOS Setup Utility.

RTC battery

System board

Allocation Error for: device

Run “Load Default Settings” in BIOS Setup Utility.

RTC battery

System board

Failing Bits: nnnn

DIMM

BIOS ROM

System board

Fixed Disk n

None

Invalid System 
Configuration Data

BIOS ROM

System board

I/O device IRQ conflict

Run “Load Default Settings” in BIOS Setup Utility.

RTC battery

System board

Operating system not found

Enter Setup and see if fixed disk and drive A: are 
properly identified.

Diskette drive

Hard disk drive

System board

No beep, power-on 
indicator turns off and LCD 
is blank.

Power source (battery pack and power adapter). 
See “Power System Check” on page 75. 

Ensure every connector is connected tightly and 
correctly. 

Reconnect the DIMM.

CPU board. 

DC-DC/charger board.  

System board