Today after I turned on my PC, I did not touch the mouse,

but the cursor moved on the screen by itself for a few seconds.

and The movement was not caused by the table or anything on the table.

Is it because my PC was hacked?

Normally when this happens it is due to the mouse misbehaving. Can unplug the mouse and restart to test. Easy solution is to try cleaning the underside of the mouse and table surface.

Cable mouse, IR remote mouse, Bluetooth mouse, or radio mouse?

 

If it is not cable connected, does it have batteries, NiMh or similar batteries, or built-in accumulators?

If it has unpluggable batteries, unplug them for second and plug again.

Check voltage of batteries. AAA should have >= 1.5 V.

 

If one lives in a multi-family house, someone next door may have the same or similar frequency and they interfere with each other.

I have similar experiences with my Bluetooth mouse.

I put it down to the "Bluetooth fairy's". (sorry couldn't help myself)  

 

Sometimes I notice that it can depend on the surface I place the mouse, I guess its the optical detection sensor picking something up like dust/grains/surface blemish etc...? 

Maybe it's just dancing around on boot up, trying find a datum point.

Is it a PC or is it a laptop? Laptops usually have a built-in touch pad that acts as a mouse. If not disabled, your thumbs can run across it and cause the cursor to move.

Maybe you gave permission to your system administrator, and he/she is now controlling your mouse cursor ...

Just kidding; probably just strain on your mouse cord resulting in movement.

On 11/7/2022 at 6:15 PM, MigL said:

Just kidding; probably just strain on your mouse cord resulting in movement.

....the easier with a mouse than with a cat....

using an old hp laptop i noticed my touchpad act so weird since using windows 11 (didn't try using others laptops)

getting better disabling two fingers scrolling, but still sometime the mouse teleport/or move so fast, and i think i'm not touching the pad with another part of my hand