This is probably not possible.
First, let's assume you can access the internals of your AIO. The processor must be socketed (not soldered onto the motherboard).
Next, you will have to check with Lenovo to find what processors are supported by THEIR BIOS.
Then, you can select from those processors.
Now, the graphics card. Assuming the AIO has one, you can then find another. But, I am going to assume the graphics are provided by the processor and there is no graphics card.
However, if the graphics are provided by a card that is removable and replaceable, then just get another card that can be used.
Do you know what your current CPU model number is, and what graphics you have?
i have AMD ATHLON 2 X2 235e processor and ati radeon 3000 graphics (integrated with AMD 760g)
i have AM3 socket and 760g chipset with k10 northbridge and sb700 southbridge
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Sorry, Intel has nothing to do with AMD processors, or ATI/AMD graphics cards. If you were thinking about using an Intel processor, they are not compatible with any AMD socket (and vise versa).
You need to contact Lenovo support for help.