a) CONTINUOUS THREE BEEPS:
Problem in RAM Connection.
b) THREE BEEPS:
(1 Long 2 Short) Problem in Display Card Connection

c) THREE LONG BEEPS PERIOD WISE:
Problem in BIOS or RAM (Basic Input Output System)

d) CONTINUOUS NON-STOP BEEPING:
Key Board Problem (i.e.; Some Key is pressed for Longer time)

All are continued may be a danger problem.
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