Please try these troubleshooting also
PROBLEM WITH BIOS
REMOVE CMOS BATTERY IF IT VISIBLE
AND REMOVE LAPTOP BATTERY ALSO
DONT CONNECT POWER
PRESS AND HOLD POWER BUTTON FOR 30 SEC
THE POWER IN BORD WILL ZERO
AND JUST CONNECT POWER WITHOUT BATTERY CHECK
IF NOT HAPPEN TRY 4-5 TIMES
what's the bios issue?
Ans.The error indicates embedded controller has timed out waiting for the BIOS to return from system board initialization (end of POST). The blinks indicate system board failure on your PC. Try restoring the BIOS to default and check if it helps.
Негізгі бет HP ProBook 820 Caps lock and NumLock blinking 5 times || Genuine solution
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