|Have you, or is it possible someone else who had access to this computer...|
- dropped it, or dropped anything on it, or otherwise exposed it to a physical jolt ?
- spilled liquid on it, or sprayed it with liquid, or exposed it to liquid such as rain ?
Has there been a power failure event that happened recently while the AC adapter was plugged in ?
If any of those things apply, the built in touchpad, or the laptop otherwise, may be damaged.
If none of those things apply, or in any case....
Is the cursor for the built in touchpad or for a mouse you have plugged in ?
If it's for the touchpad, most laptops have a key combo that toggles the touchpad on/off. If you have un-intentionally toggled that off, you may see the cursor but not be able to move it.
See the User's or Owner's manual for your laptop model.
E.g. for an Acer laptop I have on hand, the key combo is Fn plus F7, the F7 key has an additional icon that looks like a hand with an out stretched finger over the outline of a touchpad
If the cursor is for a mouse you have plugged into a USB port, if the mouse was not plugged in previously (and was not previously recognized by the same Windows installation), the cursor will NOT move while loading Windows
- if it's a corded mouse, until the desktop screen has fully loaded and generic USB mouse drivers have been loaded for it, which takes a short time
- if it's a wireless mouse that has not been damaged and that has a battery or batteries installed that have sufficient charge
- if it's a newer model, it will probably be detected automatically, but not until the desktop has fully loaded and the generic drivers for it's USB transmitter / receiver have been installed, which takes a short time. Some models require that you must press one of the mouse's buttons to get Windows to recognize it - otherwise it shuts iteself off to conserve battery power, after it has not been used for some time period.
- if it's an older wireless model, you may need to follow a procedure to get Windows to detect the mouse the first time - you may need to use a second mouse to do that
- some older wireless mice models have a tiny switch you must move to "on" or press.
See the instructions for your wireless mouse model.
(The USB wireless transmitter / receiver must be the one that came with the wireless mouse.)
If the mouse was not plugged in previously, if you can't move the mouse cursor while loading Windows and you need to Logon to Windows, use the Tab key to toggle which selection on the screen is active (fine dots around it), the cursor keys to select an item in a list, and Enter to select an active selection.
The mouse cursor will move fine after the desktop screen has fully loaded and the generic drivers for the mouse have been loaded, and will move while loading Windows after that, if nothing else is wrong.
If that doesn't help, if you have the USB connected mouse or wireless mouse transmitter /receiver
- plugged into a port in an external hub, try plugging it into a USB port built into the laptop case
- plugged into a port built into the laptop case, try unplugging other devices plugged into USB ports built into the laptop case.
(Many Laptops can't supply 500ma per USB port for the ports built into the laptop case - e.g. your mouse may stop working when a USB external hard drive or a USB optical drive is plugged into any of the USB ports built into the laptop case, either of which require 500ma from the USB port, or both that and the mouse may not work when both are plugged in.)