hello, this fujitsu the led power button and power on lights up but they flash very quickly without ram or with the wrong ram, with the right ram the leds do not flash but the screen remains black. I don't know if this is normal, I tried to reprogram the bios but nothing changes, the fan runs for a sec, even hd runs but does not load the operating system. first of all it was turned on normally with a 2gb ram, then after turning it off to put a 4gb ram the screen is no longer turned on and not even with the external one