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When a laptop or computer first powers on, it goes through an initial set of diagnostic tests to make sure vital components are preforming correctly. These tests are called POST or Power On Self Test. When a test fails, the user is notified via POST codes, Light codes, or Beep codes. For diagnosing Beep codes you need to:
Power on the laptop or restart it if it is already on.
Listen to the number of consecutive beeps when the computer begins to boot. Restarting the laptop may be necessary and should not harm the laptop at this time.
Dell Studio 15 (1555) Beep Codes
# of Beeps
BIOS ROM checksum in progress or failure
System board failure, covers BIOS corruption or ROM errors.
No Memory (RAM) detected
Memory or Memory slot failure
chipset Error (North and South bridge error, DMA/IMR/Timer error)
Time-Of-Day Clock test failure
Gate A20 failure
Super I/O chip failure
Keyboard controller test failure
System board failure
Memory read / write failure
Real Time Clock (RTC) power fail
CMOS battery failure
Video BIOS test failure
Video subsystem failure
CPU Cache test failure
Processor failure or motherboard failure
Most Common Fixes:
1 Beep: Replace the motherboard / system board.
2 Beeps: Reseat the memory or replace the memory.
3 Beeps: Replace the motherboard / system board.
4 Beeps: Reseat the memory or replace the memory.
5 Beeps: Replace the CMOS battery.
6 Beeps: Reseat or replace the video card or replace the motherboard / system board.
7 Beeps: Reseat or replace the CPU or replace the motherboard.
8 Beeps: Reseat the LCD cable or replace the LCD screen.
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