LetterSwapper

Here is my parts list:
https://pcpartpicker.com/list/m9x3w3
CPU: Intel Core Ultra 7 270k Plus
Cooler: Cooler Master 622
Motherboard: Gigabyte Z890 Aero G (with BIOS updated via Q-Flash)
RAM: 2x16GB Corsair Vengeance DDR5
PSU: Gigabyte UD750GM ICE V2
Case: Antec C6 Curve Air white
GPU: EVGA Nvidia RTX 3080 FTW (not currently installed)
SSD: Samsung 9100 2TB (not currently installed)

Problem description: New PC build won't POST

When I turn on the power supply, the PC starts up for a few seconds and shuts off (as expected), but after a few seconds it turns itself on again, runs for a few seconds, then turns off... and it does this over and over. It never displays anything

I recently acquired a Fisher MT-M300 that I want to work on, but I can't find any information on it anywhere except vinylengine[dot]com, which I can't access. Does anyone have a copy they can share?

I recently acquired a Fisher MT-M300 that I want to work on, but I can't find any information on it anywhere except vinylengine[dot]com, which I can't access. Does anyone have a copy they can share?

For the curious, I'm making a tiny electric train layout on a 12" LP (look up T-Gauge trains, they're itty bitty!). My goal is for the train to run while the turntable is spinning, but I need to slow down the motor to do that. I've tried the slowest speed the MT-M300 can do normally, but the train loses out to centrifugal force after a couple laps.

I need the service manual to figure out how to get into the guts of the player. Also, if anyone has advice on how to slow the motor without damagi

Which is better to have when you're primarily going to be using it for cleaning old tools and sharpening blades & chisels: A bench grinder or a bench-top combo disc/belt sander?

Whichever you suggest, what size is good for general use?

Last but not least, what are some decent brands for a non-pro? I'm looking to avoid cheapass junk but probably can't afford professional equipment.

Backstory: I've been given a pile of old tools that belonged to my grandpa. Most of them are many decades old at this point, and most of them are in need of cleaning. I recently restored a rusty hammer and very much enjoyed doing it, so I'm going to do the same with the other tools. I'd been using a wire w