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Cannot access to BIOS/UEFI/boot options on Lenovo h50 with windows 10
I got this computer used and want to install Windows 7 to it. So I followed whatever instruction I found on the web, got into advanced restart setting on W10, somehow found UEFI firmware settings. Restarted, got into UEFI, changed boot order to USB everything and THEN HDD. Inserted W7 installation USB stick I prepared using Rufus with UEFI and FAT32 settings.
1) It won't boot up.
2) There is no Lenovo splash screen when starting up. It either goes directly into W10 or doesn't even turn the monitor on.
3) Somehow (I think I'm going crazy) "UEFI firmware settings" option in the settings has gone. I don't have that anymore. I check via system information window, it still shows UEFI, not BIOS.
F1, F2, F8, F10, F12 is out of the question, it does not even look for an input. If I disconnect the HDD, it does not power up the monitor. It insists on booting directly to W10 without any prior screen signal or not booting at all. I've never used a UEFI PC before. I already hate it. So, what to do now? Thanks in advance.