Question Boot loop, no beeps, some fans spin some don't

Nov 7, 2019
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Hey, so I took these out of several months storage to go with a brand-new PSU. Worked fine for 3 days then it restarted all of a sudden immediately going into an infinite loop. No post, no beeps.

Weird thing is the CPU fan (powerd by an MB header) and the pair of fans that came with the case (powered direct by the PSU via a 3-pin Y-splitter) spin for a few seconds before the PC restarts... but the rear exhaust fan (Sharkoon Shark Blade 120mm) connected to an MB header doesn't spin at all.

Tried reseating the RAM again and again, same result. Tried powering the CPU fan direct from the PSU, spins but still goes into a loop.

Components gave me zero problems before going into storage. Switched to a laptop after selling my old PSU so no spare PSU on hand to test. HELP!

OS: Windows 10
CPU: Intel Core i3-4160
MB: Gigabyte B85M-HD3
RAM: G.Skill RipJawsX 2x4GB DDR3 1600HMz
HDD: WD Blue 2.5" 500GB
HSF: Cooler Master Hyper T20
Case: Cooler Master N200
PSU: Corsair VS450 ( 4 days old)