RE: 5748 will not turn on without battery.

Hi FEY42,

Thank you for writing to Dell Community Forum.

Please boot into BIOS <F2> and check the status of the battery and adapter when plugged-in.

Can you try to update the BIOS to the latest version from the Dell Support site?

Please click my DELL-username and send me a Private Message with the Dell Service Tag number and your email address.

DELL-Akshatha M
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