The green light on my pc,above the red light is not lighting.but the pc is working but not properly.the mouse always hang and the pci lancard is not detecting anymore.how can i fix it and what seems to be the problem and the cause of it.thank you very much.

Here's a guide;
What do the battery lights mean on my mouse? Some keyboard and mouse models feature a battery light that shows the current status of the batteries. The following table describes the different lights and states.
Light
Device Model Status Single long green blink Rechargeable Batteries are good. This occurs when batteries are first installed or every time that the device is turned on. Slow green blink Rechargeable Device is docked in the charging station and is charging properly. Steady green Rechargeable Device is docked in the charging station and does not need additional charging. Steady green Presenter Mouse (Japanese version) Laser pointer is on. Red/green blink Wireless Device is discoverable (trying to connect to the transceiver). Slow red blink Non-rechargeable Batteries are low and need to be replaced. Slow red blink Rechargeable Batteries are low and need recharging. Fast red blink Rechargeable Device is docked in the charging station, but there is a charging error.
Reasons for errors: The wrong type of battery is installed; the battery or batteries are missing; or the battery connection is bad.
Solutions: Make sure that the correct battery or batteries are installed, and are installed correctly. If necessary, remove the batteries, wipe them with a clean cloth, and reinsert them. Steady red Presenter Mouse (Standard version) Laser pointer is on.

If the monitor power light is on or flashing, but nothing displays, borrow a monitor from a friend. If that works, your monitor needs replaced.

If the mouse is working:
The green light only comes on when the mouse first comes on, battery change, switch on etc (as far as I can see).
I dont think you can see the red light, I can't.
My V220 works and the above are true for it.

If the mouse is not working:
Give more details; your operating system, mouse model, what you have tried...

Answer:
With the buttons toward the top:
The top LEFT slider button is for power. Slide toward the outside for ON. Light on top of mouse turns green after about 1 second, and stays green for about 10 seconds (assuming the batteries are okay). When the batteries are failing, it blinks red.
The top Right PUSH button sends a connection signal to the PC. When pressed, the indicator light on the top flashes green and red, indicating the special connection signal.
This is the mouse side of the equation (good batteries, slider turned on, connection button pressed and released.).
NOW: the PC must have a working receiver, with drivers installed, and Bluetooth software installed. it sould detect the mouse. If it asks for a passkey, say none (mouse doesn't need passkey).
You should not need Microsoft Intellipoint. it doesn't have a configuration for this particular mouse model anyway.

Good Luck!

sometimes you have to reset the mouse with the keyboard out of the aera / check the connection to the pc if the keyboard can be read and the mouse can't then the mouse has lost its transmitter

i have the same problem

Try to put new batteries.

The flashing red and green lights means that now it's in discoverable mode and it's time to add it as a bluetooth device.

I have the same issue and I think this is one of worst product that HP makes.

first u format ur windows after that same problem u replace motherboard