NO OS stated windows 7 or VISTA 64bit. which>?
ok , the mouse only issue a wire less mouse
did you load fresh drives for that from HP yet?
you can use a wired mouse as a back up, all wireless mice are problematic, google the world on that zillions of hits.
use wired,
ok now the $3 wired mouse works.
next go to device manager.
i guess you mean the lift mouse button fails but mouse pointer works. right (highlight is left click actions)
first go to control panel (wired mouse)
then see MOUSE read that page, of config, look ok.
if not reset it. (pointer tab, use default , button)
then go to , CP , control panel again, click DM device manager
see your mouse there,
right click it and pick update driver, be internet connected NOW.
im not to smart on all-in-one desktops,(i hate them)
so cant wax smart on mouse.
but here are the drivers, which one picks up mouses support not sure. but IT IS THERE.
so answer is reload driver like day one.
and the mouse can fail.. do know that. for sure the left click button switch.
https://support.hp.com/us-en/drivers/selfservice/hp-touchsmart-iq540-desktop-pc-series/3942784/model/4003111
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