iphone won't connect to new asus T100 - both phone and laptop make regular beep
New Asus T100 hybrid laptop/tablet running Windows 8.1.
iPhone 4S, up to date.
Installed, uninstalled, reiinstalled iTunes.
Authorized the computer.
Restarted phone and computer.
When I plug in the phone, it doesn't appear in iTunes.
Both phone and computer make regular beep/chime alert-type sound (about one per second). This is the same whether or not iTunes is running.
Battery and %charge icons in upper right corner of phone flash in time with beeps.
No sidebar in iTunes where I would normally see the phone icon.
?????
iPhone 4S, Windows 8