I have an old Clevo 860CU laptop that I upgraded to windows 10. This laptop was old and kept crashing as I think it was overheating (the fans were in bad condition and one would occasionally sound like a fighter jet turbine as it came out of allignment).
Anyway after I upgrade to Win10 from Win7 after couple of reboots the PC stopped booting into windows. It would get to the first Win10 logo and after few seconds power off. I tried reinstalling windows 10, Linux mint, Linux debian and windows 7 but every time the message came up to press any key to boot from USB/CD, instead of booting from the aforementioned devices, the same Windows 10 logo would pop up!
So I thought maybe my bios is destroyed, restored default settings, removed hard-drive from boot options but then PC would still not boot from any external media source. I took out my laptop hard drive, formatted it externally from my desktop and tried booting windows 7 install USB. Somehow, upon clicking boot from USB from boot options, the same windows 10 logo would come up!
I was very confused, took out the hard drive again and this time installed fully windows 7 on it. Checked on my desktop that this windows 7 boots up, checked that the partions were all formated and there were no hidden ones. Placed the hard drive into the laptop, and somehow, even thought the hard drive has been fully formatted and a tested, bootable windows 7 installed; the windows 10 logo comes up!?
So my question is how? What does windows 10 do to boot?
Anyway after I upgrade to Win10 from Win7 after couple of reboots the PC stopped booting into windows. It would get to the first Win10 logo and after few seconds power off. I tried reinstalling windows 10, Linux mint, Linux debian and windows 7 but every time the message came up to press any key to boot from USB/CD, instead of booting from the aforementioned devices, the same Windows 10 logo would pop up!

So I thought maybe my bios is destroyed, restored default settings, removed hard-drive from boot options but then PC would still not boot from any external media source. I took out my laptop hard drive, formatted it externally from my desktop and tried booting windows 7 install USB. Somehow, upon clicking boot from USB from boot options, the same windows 10 logo would come up!

I was very confused, took out the hard drive again and this time installed fully windows 7 on it. Checked on my desktop that this windows 7 boots up, checked that the partions were all formated and there were no hidden ones. Placed the hard drive into the laptop, and somehow, even thought the hard drive has been fully formatted and a tested, bootable windows 7 installed; the windows 10 logo comes up!?

So my question is how? What does windows 10 do to boot?