AB350 Pro4 no power after flash from 4.60 to 4.70

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   Instant Flash said it was successful so I hit enter to reboot and the system reacted like it lost power (its Corsair AX850 is plugged into a Cyberpower CP1500PFCLCD with a full battery).  I cannot get the system to power on now.  Would appreciate some thoughts while I troubleshoot...

To get to this point I booted into the BIOS and F9'd/loaded the UEFI defaults.
After F10'ing to save and reboot I did F6 to Instant Flash and flashed 4.70 from a Mushkin 8GB USB formatted to FAT32.
As mentioned the process indicated it was successful so I hit enter to reboot...

I have jumpered the BIOS which resulted in no change.
Am letting the system sit ATM without the CMOS battery.
If that doesn't work I am going to try a spare PSU.

System specs:
Lian Li PC-A05FN
Corsair AX850
ASRock AB350 Pro4
AMD Ryzen 2400G
CORSAIR Vengeance LPX 8GB (2 x 4GB) DDR4 3000 CMK8GX4M2B3000C15
Toshiba OCZ ARC 100 240GB

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dil@cerated Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Apr 2018 Status: Offline Points: 4	Post Options Post Reply Quote dil@cerated Report Post Thanks(0) Quote Reply Topic: AB350 Pro4 no power after flash from 4.60 to 4.70 Posted: 11 Apr 2018 at 10:10am
	Instant Flash said it was successful so I hit enter to reboot and the system reacted like it lost power (its Corsair AX850 is plugged into a Cyberpower CP1500PFCLCD with a full battery). I cannot get the system to power on now. Would appreciate some thoughts while I troubleshoot... To get to this point I booted into the BIOS and F9'd/loaded the UEFI defaults. After F10'ing to save and reboot I did F6 to Instant Flash and flashed 4.70 from a Mushkin 8GB USB formatted to FAT32. As mentioned the process indicated it was successful so I hit enter to reboot... I have jumpered the BIOS which resulted in no change. Am letting the system sit ATM without the CMOS battery. If that doesn't work I am going to try a spare PSU. System specs: Lian Li PC-A05FN Corsair AX850 ASRock AB350 Pro4 AMD Ryzen 2400G CORSAIR Vengeance LPX 8GB (2 x 4GB) DDR4 3000 CMK8GX4M2B3000C15 Toshiba OCZ ARC 100 240GB

dil@cerated Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Apr 2018 Status: Offline Points: 4	Post Options Post Reply Quote dil@cerated Report Post Thanks(0) Quote Reply Posted: 11 Apr 2018 at 11:43am
	Culprit --> Gremlins from G2? Put a new Corsair RM650i in and the system is up and running... The AX850 is powering on outside of the system using the paperclip trick. I knew I should have bought some Vodka on the way home tonight.