Purchased OptiPlex 3040 with Windows 7 Factory downgrade install. Now want to install Windows 10 from the Dell supplied OEM DVD.
Have followed these instructions www.dell.com/.../SLN288177
and these en.community.dell.com/.../19988139
but neither of them work.
After changing the BIOS settings & re-booting I get a Dell SupportAssist screen with a white cross inside a red circle and the only option is a shutdown button.
Anyone else experienced this and have a solution ?