Howdy,

I have adopted a fairly basic but capable Samsung i5 laptop.  A fresh install had it running like a dream on 8.1 and all was well for several weeks.  

Suddenly it has developed a weird fault: Occasionally when plugged into the AC, it adopts the AC power settings and shows the battery is charging for a few seconds (or minutes) and all all seems fine, then it will stop charging, and drop back to using battery power.  The AC and charging indicator on the front alternate flashing, I guess signalling an error of some kind, although Mr Google can't seem to help define what that means.  

This was happening only every so often, but has developed to almost constantly now.  The weird thing is the laptop works just fine on AC alone (battery removed), the battery charges as normal when the laptop is powered down but plugged in to AC, it just can't seem to do both at the same time.  The battery still keeps a good charge lasting 3+ hours of constant use.

I have tested the AC supply and the connector and all seems normal.  I can't fault the AC jack either, and the fact it works normally when the battery is removed suggests the AC is not at fault.  

Only thought now is that the charging system is malfunctioning, but hoping there may be a software setting somewhere that could be forcing it to default to battery?  

Anyone know what the flashing lights mean, or what may be causing the problem? I am reluctant to shell out for  a new battery given it seems to charge and run OK (when the laptop is powered down)

Thanks