Satellite L645 - power & battery led keep blinking

I have toshiba L645 that just bought like a year.
Since few weeks i got this power & battery led give me yellow blinking.
My L645 can be on by using battery alone & does't give any blinking led but if i connect the power AC plug it give me power & battery blinking like 1 second per blink and if i unplug battery and trying to on using power AC alone my laptop suddenly turn off when this blinking occur.
What is going on with my L645? Any suggestion?
Thanks in advance.....(by the way my L645 running with windows 7 Home Premium)

Hi
The power LED flashing means that there is a problem with the power supply.
Im not quite sure but possibly your AC adaptor is not OK.
I think the notebook should be checked using the new AC adaptor.
But of course if could be also a problem with power supply electronic on the motherboard. In such case the new AC adaptor would not help you but in such case the motherboard should be replaced.

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