Hello,
I have bought older laptop latitude e6520, that was used in enterprise company before. It was running ok, until I upgraded RAM to 16GB. After hw change, windows wont boot either to system, or new installation. It always hangs at the screen with ms flag and rolling balls and hangs. Either win7 or win10 installation/boot. I can boot with no problems to ubuntu and all hw diagnostics are OK. I have tried to restart bios, upgrade bios, remove cmos battery for a while, revert hw change, but it still fails. Do you have any idea, what could cause that? I have tried with original disk and two different hdds and result is still the same. Should that be any protection in laptop from that enterprise company? When the laptop is booting, there is everytime shown name of that company.
I have no idea what to try now. I can run windows virtually from ubuntu, but I would like rather to have dualboot setup with native windows.
Service tag 4FDPGV1
Thank you for any help, I am stuck :( Regards, Vojtech.