The laptop is a Toshiba Tecra A11-110 with an intel i5 processor.
I replaced the first RAM with the second one. The Windows begins to boot but ms later shuts down and the computer restarts again. Maybe the reason was that the second one was 1,5V. An analysis on Kingston website says these are the compatible ones, 1,35V. So, I bought the third one you see in the image. But the same thing happens: windows can't boot, it begins but quickly dies.
What could it be? Thank you.