For the past couple of days I was experimenting with Ubuntu. I am running Ubuntu 14 (BIOS) on a Dell xps 15Z. I used a USB drive to install ubuntu on this system (HP formatting tool & YUMI) however since a failed a try in installing WIN 7 OEM via usb, this system does not boot with live USB anymore: " Operating system not found."
I tried to remake the usb via another laptop running windows, the usb works on that laptop but not on the this one running ubuntu; Then I made a live usb using "Startup Disk Creator", which still does not work on this laptop.
Any ideas what is the cause and how I can fix it?
p.s: I do not have CD/DVD drive on this laptop.
Thanks in advance