(Redirected) Dell 1558 does not turn on

The computer was not used frequently. When I turned it on I was asked to tune the date and time. It happened several times and I Understood that I should change CMOS 3V battery. After that the laptop blink one tome but didn't turn on.

I was recommended to change power button. After I did that the laptop is dead. It looks like a brand new . But no power, no light even for a second.

Any advice? thanks in advance.