Hello,
Working on new build....
MB: ASUS Crossfire VII Hero x470
CPU: AMD Ryzen 7 3700X
PSU: EVGA 1000 G+
GPU: EVGA Geforce GTX 1660 Ti 06G-P4-1667-KR
Memory: HyperX Predator HX432C16PB3K4/32
M.2: Samsung V-NAND SSD 970 EVO Plus NVMe M.2

I have been encountering a Q-Code of 02 and the Boot Led illuminated. I have RMA'd the motherboard, but still same issue. I believe one of the M.2 sticks is hosed since Windows doesn't recognize it as a drive to install. So, after I swapped it out , still get the Q-Code 02 and Boot Led, but was able to install Windows after exiting the Bios Menu without saving.

So, I just ordered different memory G.SKILL Ripjaws V Series 32GB (4 x 8GB) 288-Pin DDR4 SDRAM DDR4 3600 (PC4 28800) to see if that is the issue. Will be here in 3 days. If that does not fix the issue, then next would be a graphics card swap-out.

Has anyone has issue with the GTX 1660 Ti cards?
 
Before you ask, I have re-seated, unplugged, re-plugged and done several Bios down grades and upgrades. The current Bios level is 3004.
 
So, while I am waiting for the new DDR4 sticks to arrive, I thought I'd do some more analysis....

I noticed that the boot led lights up when Q-Code 99 is first displayed. Hmm, maybe even though I can boot from the M.2, it's the issue with the boot led. So, I removed the M.2 and plugged in a Samsung 860 EVO SSD. Still the same issue, green/yellow boot led and Q-Code 02.

Also, I unplugged the Corsair H115i Pro water cooler from the board, only temporarily, to see if that was the issue. Nope same issue.

Today, I decided to remove the graphics card and boot.... well, the q-codes roll by and still the 02 with Boot Led and now the GPU Led.
 
So, does that mean the graphics card is eliminated from the possibilities of the cause of my build issue?

I would be inclined to put a conventional SATA HDD in and try it..Even if you have to buy one you can get a good 250GB drive for under 20 bones these days, like a Western Digital Blue.