Can I somehow turn on a laptop fan without a laptop? And if yes. How?

L.g.

Connect to the 5V or 12V wires and the thing turns.

If you think it is removed, then you have to see which cable of the fan provides the power supply and depending on the polarity, it rotates in one direction or the other. It is not recommended to tinker with it built-in

And where are the wires?

The fan should only have 2 wires. One is red (?), Maybe yellow, the other black.
Ground (GND, zero) comes to the blacks. The other must then be connected to the 5 or 12 V

The wires are in the connection cable of the fan.

#### the first thing you do is of course turn on the CPU, and finally the case. So no idea about Pcs.

Normal
Simply in the hazardous waste 1.2 against 12 is not possible. It urges your.
Mario are 1.5 volts. 15 voltsinein lightning. You shot the battery