Mac Pro 3.1 struggling to power on (takes multiple attempts) PSU?

Hi,
Apologies if this has already been answered in other forums, I had a look but couldnt see anything specific.
My 2008 MP has been giving me some very frustrating power on problems over the last few months. (probably around 3-4 months TBH)
I switch it on and it starts to power up but will switch off at varying points, sometimes its before the apple logo appears on the screen, sometimes its just after that, other times it gets to and past the log in/password screen.
When it first started happening it would only take a few attempts to get it powered on fully and once on, it works fine and stays on with no trouble.
I am paranoid to switch it off now as the last two times I switched it off and powered it back on it took over 20 attempts and the last time it was over 40.
It kind of sounds like it is struggling to get enough power to drive the things that are needed to get it going (almost like a poor battery in a car on a winters morning), which of course makes me think it is the PSU that is weak.
I'm no expert and this is totally a hunch.
I do not want to throw much money at it as I am probably looking to upgrade to the new MP when released and settled down but I can't leave the machine on indefinitely.
The boot drives are SSDs if this is of interest to anyone, I havent tried unplugging any external devices to see if this solves the issue as truth be known I just don't think it would power back on if I swithced it off again.
I would love to hear what you think, also if it were likely to be the PSU, how much would one cost apporx in the UK and where would I get one from, I'm happy to put a good 2nd hand one in.
Thanks in advance,
Jason

If you have RAM that sometimes shows as less than what it should be, start removing and replacing. FBDIMMs do fail, the longer the more likely.  8 DIMMs is ideal, gives 15% boost. Might be late to the table to  invest $40?
if you have an SSD, what make and model and firmware version. And you have multiple, well a stripe? only that does not really help the system performance except larger volume. TRIM probably will not work wtih software RAID.
2008's do seem to be problematic with powering up. Which was why there were EFI and SMC updates to 'cure' the freezing on wake from sleep of early first edition 3,1's - firmware updates are never as good as new  boards, chips, and factory firmware it would seem. Waiting 3-4 months after new models come out usually skips those issues.
People have swapped out PSU. The GPU in the 2008's should definitely be replaced if it is OEM, or even if it is 8800 or 4870 probably too. Sometimes just GPU dust.

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