First post, by kalm_traveler
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Hi guys, just looking for some suggestions here...
So this Tyan dual socket 370 motherboard arrived today, I cleaned it up, got both 1.4ghz Tualatin chips in, etc etc wouldn't post. Several hours of troubleshooting later (Trying multiple CPUs, RAM sticks, etc) eventually out of morbid curiosity I connect my only vintage PSU, some funny V-Power 400w hunk o junk but it has 40A on the 5v rail.
Now... I know all about how modern PSUs are 12v heavy and light on the 5v, but when I was trying to do a TUSL2-C build, I found that Corsair PSUs have a bit of 5v to them, so I picked up an HX1200 which has 30A on the 5v and 3.3v rails, and that all seemed to be fine and dandy for the TUSL2-C even with full PCI slots, RAM slots, drives, etc.
With this Tyan board, it has 1 RAM stick populated and only the AGP video card installed (well, plus two CPUs and 2 12v fans) but just won't POST except with that old PSU.
I notice also that the newer PSUs I've tried do not have -5v, but that is for ISA cards, and this doesn't have any ISA slots so I'd be a little surprised if that was the reason for not actually POSTing.
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So basically - with either modern PSU, it will 'power up' in that all the fans start spinning and if I remove the 1 RAM stick it beeps about not having RAM, but never posts. If I connect the ~ 2001 PSU it POSTs just fine.
Is it really possible that the jump from 30A to 40A on the 5v rail is really the issue? or that somehow lacking the -5v wire is causing this? I'm going a little batty.
Any thoughts or suggestions will be greatly appreciated!
Retro: Win2k/98SE - P3 1.13ghz, 512mb PC133 SDRAM, Quadro4 980XGL, Aureal Vortex 2
modern:i9 10980XE, 64gb DDR4, 2x Titan RTX | i9 9900KS, 32gb DDR4, RTX 2080 Ti | '19 Razer Blade Pro