Failing to revive MacBook Pro

[Ben Rubinstein]

A MacBook Pro, probably approx 2014 model.

On the shelf for perhaps a year, after many years of faithful service.

Last week I started it up, cleaned off old users, installed a new admin user.
All good. Shut it down.

Today I pressed the power button again, it shows an apple logo, progress bar
gets perhaps 25% of the way through, then it restarts again.

Attempting to start shift key down makes no difference. But it doesn't often
seem to recognise start up keys.

I managed to zapping the pram once: the only difference that made is that now
I hear the startup clang over and over again as it repeatedly restarts. I wish
I hadn't!

I put in USB key with a bootable MacOS, and managed once to start with option
key down, and be offered a choice of boot modes - but then it restarted again.

I managed to enter recovery mode once, got as far as inviting me to select a
WiFi network - but then it restarted anyway before I can get as far as
entering a password.

Any ideas what this might be? Any ideas how I can make progress, or fix it?

(I've got a similar slightly older version MacBook Pro that I could sacrifice
if necessary for parts if necessary. Might it be hard drive or memory related?)

All suggestions gratefully received.

Thanks in advance,

Ben

[Jason Davies]

Bit of a long shot but have you reset the SMC?

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Cheers,

Jason