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Dell bios dell 3521-la-9104p-1.0-ok

hi need some help
i have issue 1 beep programed bios main and ec ok machine power up work OK when i shutdown and unplug charger same problem again 1 beep after reprograming EC start ok but sae problem when i shutdoen and unplag charger 1 beep again. attached original dumps
this can not problem bios, you need try BIOS other and compare,
When two BIOSes give the same result next you need to check the hardware.
 
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