Looks like I am having a similar problem. Ordered a RapidRoad from AmigaKit.com and installed about 8 weeks ago. It was working fine with flash drives. I last used about 1-2 weeks ago. 2 days ago opened the case to install a slot fan (Evercool Fox-1 )when I booted to check the fan, I noticed the white light was not on anymore. It is no longer detected in Trident. This is a v6.3 motherboard and a recapped (one year ago) original Amiga powersupply (204watt). Buddha still working.
The RapidRoad was purchased in October, delivered 11/13/2020. I'm assuming that this unit does not have the circuit protection mentioned in other posts? Is their any other troubleshooting I should attempt?