Re: AsRock 890GX Extreme3 & FX 8120 - strange pause on booting before BIOS appears on screen
Without knowing more about your system (see my sig below) it's hard to help.
You are obviously having hardware issues(s).
Try removing unnecessary hardware and running with just CPU/cooler, one stick of RAM and onboard video.
If that works then shut down and start adding hardware and rebooting until you find the problem.
My guess is RAM - wrong settings with timings or voltage.
It's always difficult with all 4 DIMM slots populated.
My HTPC -
ASRock 970 Extreme3
AMD FX-4100 w/Coolermaster GeminII S cooler
M Station HT-1100 HTPC Media Center case
Antec 480 NeoPower PSU
Kingston HyperX Blu 8GB KHX1600C9D3B1K2/8GX
Gigabyte GV-R467ZL 4670/1GB video card
Hitachi HDS721050CLA362 500GB SATA hd
Windows7 Ultimate x64 & Ubuntu 10.04 LTS (partitioned)
Pioneer DVR-215D SATA DVD burner
Samsung 40" 1080p 120Hz LCD HDTV LN40C630
You can teach an old dog; it just takes longer.