hiya, i know it is vague - but also, if the case fans aren't doing anything whatsoever - does this not also point to the PSU being faulty. The fans are only connected to the psu, rather than to the mobo for power. Is this possible, or does the mobo control power to everything?
Not necessarily. Connect the PSU to the motherboard (main power AND 4/8 pin CPU power). Connect the PSU to the fans. Connect the case power switch to the motherboard. If there is a power on/off switch on the PSU, make sure it's on. Press the power switch on the case. That should turn on your fans.
re-set cmos, reseated cpu, rewired whole thing - and it works?
It works. Thanks for all your assistance guys, it's been a massive help!
Did the paperclip test on the PSU and the case fans - and once i knew the PSU def worked, I could start putting it together bit by bit again, outside the case (breadboard) then inside. all good. Just formatting the Tb drives now, taking eons.