Since 1 month, if i press the power button, the laptop goes ON, (with the lights in the right corner) BUT the Laptop goes immediatly again to OFF without any reason!
If i press again the power button, the laptop goes ON and stays ON.!
I must always press twice so that the laptop stays on!
Can someone tell me, what's going on ?
Could be something as simple as memory not fully seated, or as severe as a mainboard going bad.
Unplug the system, remove the battery and hold the power button for 30 sec. Remove and reinstall both memory modules and the hard drive.
Try powering up on AC only - if it will consistently do that but won't with the battery installed, replace the battery with a new one.
If the problem continues after that process, run a full system diagnostic. If a bad memory module or drive is found, replace it.
If that doesn't pinpoint the problem, replace the mainboard.