Beep Codes
When no error message is displayed but the computer stops during POST, listen for beep codes.
Beep | Status | Possible Causes |
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One short beep. | System ready | System is OK. |
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Continuous one | Memory not installed or | • Something is wrong with the memory installed |
long beep | memory error | • There is problem accessing the memory (i.e., mainboard |
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| |
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| problem) |
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One long beep, then | VGA not installed or | • The mainboard can not access the video card for some |
two short beeps and | VGA error | reasons. Either the video card is not working, its memory |
repeat |
| is not accessible, or its BIOS may be corrupt. |
|
| • Something is wrong with the mainboard. |
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One long beep, then | BIOS failure | BIOS damaged. Processor jump to boot block to execute |
one short beep |
| the default procedure. |
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Two short beeps. | CMOS failure | CMOS checksum error |
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Undetermined Problems
NOTE • Verify that all attached devices are supported by the computer.
•Verify that the power supply being used at the time of the failure is operating correctly. (See “Power System Check” on page 67)
Follow the procedures below to isolate the failing FRU. Do not isolate
1.Power off the computer.
2.Visually check them for damage. If any problems are found, replace the FRU.
3.Remove or disconnect all of the following devices:
•
•Printer, mouse, and other external devices
•Hard disk drive
•DIMM
•
•Expansion boards
4.Power on the computer.
5.Determine if the problem has been resolved.
6.If the problem does not recur, reconnect the removed devices one at a time until you find the failed FRU.
If the problem persists, replace the mainboard, and then LCD assembly (one at a time). Do not replace a
82 | Aspire Z3750 / Z3751 / Z5750 / Z5751 AIO Computer Service Guide |
