You connect new ISO image and try to boot from it , but instead booting from Image , VMware loads installed OS , sounds familiar?

Here what you should check:

First make sure that CD room or image are selected as “Connected” and “Connect at power on”
By default VM machine tries to boot first from attached CD device

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If you still can’t boot navigate to Options>Boot Options and in the right pane under “force BIOS Setup” select "The next time the virtual machine boots, force entry into the BIOS setup screen”
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After you start VM machine you will be able to access BIOS settings and Edit boot priority.

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