Pavilion zd7000 starts in battery mode only; runs on AC only when connected to printer by USB port

My Pavilion zd 7379ea will only start up in battery mode. AC adapter appears OK with a firm green LED, so external power supply may not be the issue here? When I'm starting up (with what's left on the battery), both the charging LED and the AC LED are constantly blinking. When turned off, the battery LED is firm, and battery appears to be charging (but which obviously is not the case). Occasionally, when computer is turned off, the AC LED is lit with a firm light.
One odd thing I noted before this happened was that the computer ran on AC only when my HP printer was connected to one of the USB ports (no battery inserted). If I disconnected the printer USB cord, the computer just died immediately; it was like the computer was powered by the printer. Later I also discovered that the same cord (where it connected to the printer) had melted from extreme overheating. I tried to update the USB drivers for each port but it didn't change things. I also tried to connect a different printer to get the computer started but it didn't work this time. I'd be extremely grateful for any comments that may solve this power supply issue (and if possible explain the stuff with the printer connection).
S/N{removed for privacy]; P/N PH989EA#AK8

Hi,
Schindi285460 wrote:
My Pavilion zd 7379ea will only start up in battery mode. AC adapter appears OK with a firm green LED, so external power supply may not be the issue here? When I'm starting up (with what's left on the battery), both the charging LED and the AC LED are constantly blinking. When turned off, the battery LED is firm, and battery appears to be charging (but which obviously is not the case). Occasionally, when computer is turned off, the AC LED is lit with a firm light.
One odd thing I noted before this happened was that the computer ran on AC only when my HP printer was connected to one of the USB ports (no battery inserted). If I disconnected the printer USB cord, the computer just died immediately; it was like the computer was powered by the printer. Later I also discovered that the same cord (where it connected to the printer) had melted from extreme overheating. I tried to update the USB drivers for each port but it didn't change things. I also tried to connect a different printer to get the computer started but it didn't work this time. I'd be extremely grateful for any comments that may solve this power supply issue (and if possible explain the stuff with the printer connection).
S/N{removed for privacy]; P/N PH989EA#AK8
You unplugged a USB device while the notebook was still booted into Windows and on?
Normally that won't cause any issues but , If you did that you may have damaged your system board's Southport chip.
USB is not a plug n' play port like SATA and eSATA are.
Here is a link to the maintenence manual for your laptop series.
Is your notebook still within warranty? By the processor components listed in the manual,I believe it is probably not.
best regards,
erico
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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