Hi guys, I've been brought a Toshiba C55Dt-C5245 laptop to have a look at, it's been used by a teenager who has done usual stupid teenager crap on it and I just want to blow it away. No matter what I try though I can't get it to boot from USB. I have a known working (tried and tested) bootable usb stick with Win10 1709 on it, it happily boots on any other machine I stick it in. I press F12 on this toshy to bring up the boot menu, it correctly identifies the brand/model of usb stick connected and offers it as an option to boot from, but when selected it just boots from the hard drive anyway. I've tried with secure boot enabled/disabled, setting USB as the first boot device and the HDD as the last, resetting to default etc, it doesn't care. The only thing I haven't tried yet is pulling it apart and removing the hard drive so it has no option but to boot from USB.. I'd definitely like to avoid pulling it to bits though if I can... Any ideas?