Optigx620 520Sff
Interesting, if you have a DELL Optiplex GX520 and put a cell phone near the CDROM drive as you receive a SMS/TXT (or perhaps a call) – it will shut down the computer – “The bug appears when you put your mobile phone close to the cd-rom unit of the dell and then recieve a sms/txt. What happends is it goes into some sort of suspension mode from which you can’t bring it back without breaking power or holding down the power button for four seconds.” [via] – Link.

Usually you can hear clicking and noise through some computer speakers when a phone is getting a signal, or right before it rings – so the DELL might just be triggering a fault and shutting down or something. Cool way to do a remote shutdown :)