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I changed my Lenovo T500 from 'Switchable Graphics' to 'Discrete Graphics' in the BIOS.

Now I don't get any display out on the internal LCD, or an external VGA monitor. Not even the POST screen.

How can I revert to Switchable Graphics or Internal Graphics mode?

Even if somebody could just give me BIOS photos I might be able to step through it blind ...

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Try F1 to enter the BIOS, F9 to load defaults, F10 to save and exit. Both F9 and F10 will give you a yes/no prompt, but unfortunately I don't know if they default to 'yes' or 'no'.

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You can always press 'Y' key to make it 'yes', no matter the default is 'yes' or 'no' – Bilo Feb 24 at 2:36

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