Go to topic: Problem HTC 8 S - Monwindowsphone.com (Blog)

Is what you were doing an update

Try the soft reset and if that does not work the hard reset

soft reset:. remains supported on 10 sec the power button does not work if
: just pressing more on low volume

hard reset. the phone must be off: low volume + power briefly …
a icon [! ] Should appear release the button below
flight and after. Volume up> volume down> power> Volume down