I have recently obtained a Mac Mini second-hand from an organisation. When I power on the device it boots Windows 7, however, I'm unable to boot from a USB due to the Mac Mini not opening it's Startup Manager/BIOS/Boot Menu/Open Firmware... whatever it's called.
I've tried Alt, F8-12 and even tried Shift for safe mode but every time it boots Windows 7.
If the organisation has blocked the boot menu from loading is there a way to unblock it (and possibly boot from a USB).
Edit: I only own a Windows QWERTY keyboard... is that the issue?