Thanks. Just found this:
Chapter 4: Diagnostics
If you experience problems with setting up your system, always check the following things in the following order:
By checking these items, you will most likely find out what the problem might have been when setting up your system. For more information on troubleshooting, check the TYAN
4.1 - Beep Codes
Fatal errors, which halt the boot process, are communicated through two kinds of audible beeps.
A single long beep followed by two short beeps: It indicates that a Video error has occurred.
A single long beep repeatedly: It indicates that a DRAM error has occurred. The most common type of error is a memory error.
Before contacting your vendor or TYAN, note as much as you can about the beep code length and order that you experience. Also, be ready with information regarding add-in cards, drives and O/S to speed the support process and come to a quicker solution.
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EDIT: it is just one REALLY long BEEP (30+ seconds). I think I have faulty DRAM, according to the manual.
Not PSU-> I swapped with two other PSU and the same beep occurred with all 3 PSU.
The beep length is really long. Going to contact the eBay seller.
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Edit 2: according to this post by JDM, https://www.reddit.com/r/JDM_WAAAT/comments/geyzkh/continuous_alarm_tone_on_tyan_s5512_mobo/
It looks like I have additional issues. I am using a VGA->HDMI plug so I cannot see my BIOS. Additionally, it could be a fan setting in the BIOS and not the RAM. I have the Cooler Master Elite 350 case and tried the included PSU and a Corsair 750W PSU. It appears that it is also not a RAM issue.
I now believe it is a fan setting issue in BIOS (causing the 30+ second nonstop long beep) and is compounded by the fact that I cannot see anything since I am using the VGA—> HDMI converter. Did not expect to encounter so many issues