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Dell 1558 doesn't power on
My Dell 1558 was not used frequently since I had 5 computers to work with. When I turned on my Dell 1558 a month ago, I was asked to tune date and time. This happened each time when I turned it on. I found out that the reason was the 3 V CMOS battery to change. When I changed it the computer didn't turn on ; power button light blinked and off. I was advised to change power button. I did it but now there is no even light for a second. There is no power at all. I have a tester but it is not clear how to find the proper point to measure what blocks the power supply.
I would be thankful to hear some ideas what happened and why?
Thanks in advance.
Rafael