I got the adapter cable to connect to the RJ45 serial management port on the v240 earlier today, and I successfully managed to boot it to OBP after a bit of fiddling around with parts. There seems to be an alert which I have been unable to identify or address so far, but it otherwise seems to pass all init tests with no remarkable issues. I will install the second CPU tomorrow and will start troubleshooting the parts which I got from the Blade 2500. With a bit of luck, I should hopefully manage to get a better picture of the condition of these parts as somebody suggested before.
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Booting to OBP