I am sorry for your trouble but let me help you.
Thanks for providing the steps you have done so far. There are some other things I would like to know:
- Was there any change on the configuration? Any program or update installed?
- Is there a possibility to test another AC adapter?
- Try different cables and power source.
Reseating the the RAM, moving the SSD and clearing the CMOS by taking the battery and a BIOS recovery are excellent steps so if you do the steps mentioned above and issue persist, It may be necessary to replace the unit.
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