Last night I left my laptop on stand by and went to sleep… When I woke up in the morning, the laptop was turned on, but the screen was black! The fan was rotating with a high speed, the computer was on, but the screen was black… So, I turned off the computer by keeping pressed for some seconds the power button.

After it switched off, I tried to turn it on again, but nothing was working! I kept pressing some times, but it was like the computer was dead! I found a way on some youtube videos by pressing the power button for about 30 seconds, but that didn’t work! When I plug in, the battery gets charged, but the laptop won’t turn on. I have an Acer Aspire 7720G! I noticed that when I pressed the power button, like a type of little noise came out near the power button, like it blips for a bit of a second every single time I press the power button.

For anyone who comes to this question again

I solved this problem by myself, since even at a computer repair center, they told me I need to replace the motherboard!!!
Anyway, this is how I solved:
1. Removed battery
2. Reset the internal electricity (like ha14 said above)
3. Removed RAM sticks, removed Graphics Card, CPU, fan.
4. Replaced thermal paste, and did a total cleanup of dust or anything…
5. Put everything back, and also tried to fix the power button by pressing a lot of time at the button..
6. At this step my computer was back!!!

I’m still confused since I think the main problem was the power button, since even when I tried the other steps, my laptop wouldn’t work! After doing that trick with the button, now it works! If anyone has anything to say about this, please I would like to hear his/her opinion!