Error code A2 - Cannot reset BIOS

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   I did run memtest64 and no error found.

Here the log:

Module 0:
  Empty
Module 1:
  DDR4, 8192 MB, 64-bit, 2133 MHz
  ChannelA-DIMM1 BANK 1 Kingston KHX2133C14D4/8G
Module 2:
  Empty
Module 3:
  DDR4, 8192 MB, 64-bit, 2133 MHz
  ChannelB-DIMM1 BANK 3 Kingston KHX2133C14D4/8G

0.000: Detecting usable memory (16332 MB theoretical max)...
16.047: 14144 MB Test starting on 4 CPUs...
16.093: Allocating memory...
24.812: Starting loop 1
24.828: Stuck Address Test...
29.156: Random Data Test...
34.453: Move Data Test...
36.593: Bitpattern Test...
144.593: Starting loop 2
144.609: Stuck Address Test...
148.640: Random Data Test...
153.797: Move Data Test...
155.953: Bitpattern Test...
263.843: Starting loop 3
263.859: Stuck Address Test...
268.000: Random Data Test...
279.093: Move Data Test...
281.234: Bitpattern Test...
388.359: Starting loop 4
388.359: Stuck Address Test...
392.390: Random Data Test...
397.531: Move Data Test...
399.672: Bitpattern Test...
506.187: Starting loop 5
506.187: Stuck Address Test...
510.203: Random Data Test...
515.328: Move Data Test...
517.484: Bitpattern Test...
625.125: Starting loop 6
625.140: Stuck Address Test...
629.140: Random Data Test...
634.281: Move Data Test...
636.422: Bitpattern Test...
743.078: Starting loop 7
743.078: Stuck Address Test...
747.093: Random Data Test...
752.265: Move Data Test...
754.406: Bitpattern Test...
862.578: Starting loop 8
862.578: Stuck Address Test...
866.593: Random Data Test...
871.797: Move Data Test...
874.015: Bitpattern Test...

... it looped for another 76 times ...

10005.140: Test finished with no errors detected

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dani958 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jan 2021 Location: Italy Status: Offline Points: 11	Post Options Post Reply Quote dani958 Report Post Thanks(0) Quote Reply Posted: 14 Jan 2021 at 6:56pm
	I did run memtest64 and no error found. Here the log: Module 0: Empty Module 1: DDR4, 8192 MB, 64-bit, 2133 MHz ChannelA-DIMM1 BANK 1 Kingston KHX2133C14D4/8G Module 2: Empty Module 3: DDR4, 8192 MB, 64-bit, 2133 MHz ChannelB-DIMM1 BANK 3 Kingston KHX2133C14D4/8G 0.000: Detecting usable memory (16332 MB theoretical max)... 16.047: 14144 MB Test starting on 4 CPUs... 16.093: Allocating memory... 24.812: Starting loop 1 24.828: Stuck Address Test... 29.156: Random Data Test... 34.453: Move Data Test... 36.593: Bitpattern Test... 144.593: Starting loop 2 144.609: Stuck Address Test... 148.640: Random Data Test... 153.797: Move Data Test... 155.953: Bitpattern Test... 263.843: Starting loop 3 263.859: Stuck Address Test... 268.000: Random Data Test... 279.093: Move Data Test... 281.234: Bitpattern Test... 388.359: Starting loop 4 388.359: Stuck Address Test... 392.390: Random Data Test... 397.531: Move Data Test... 399.672: Bitpattern Test... 506.187: Starting loop 5 506.187: Stuck Address Test... 510.203: Random Data Test... 515.328: Move Data Test... 517.484: Bitpattern Test... 625.125: Starting loop 6 625.140: Stuck Address Test... 629.140: Random Data Test... 634.281: Move Data Test... 636.422: Bitpattern Test... 743.078: Starting loop 7 743.078: Stuck Address Test... 747.093: Random Data Test... 752.265: Move Data Test... 754.406: Bitpattern Test... 862.578: Starting loop 8 862.578: Stuck Address Test... 866.593: Random Data Test... 871.797: Move Data Test... 874.015: Bitpattern Test... ... it looped for another 76 times ... 10005.140: Test finished with no errors detected
	Intel i5 6600k - EVGA GTX970 SSC - HyperX 2x8GB 2666MHz - ASRock Z170 Pro4 - XFX P1-650G-TS3X

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25028	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 14 Jan 2021 at 10:29pm
	RAM should be installed in slots A2 and B2 for optimum performance with 2 modules. Try this for clearing CMOS: http://forum.asrock.com/forum_posts.asp?TID=630&title=how-to-clear-cmos-via-battery-removal


dani958 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jan 2021 Location: Italy Status: Offline Points: 11	Post Options Post Reply Quote dani958 Report Post Thanks(0) Quote Reply Posted: 20 Jan 2021 at 12:19am
	Thanks Xaltar I already did clear CMOS many times and the RAM sticks are in the right position Module 0: A1 Empty Module 1: A2 DDR4, 8192 MB, 64-bit, 2133 MHz ChannelA-DIMM1 BANK 1 Kingston KHX2133C14D4/8G Module 2: B1 Empty Module 3: B2 DDR4, 8192 MB, 64-bit, 2133 MHz ChannelB-DIMM1 BANK 3 Kingston KHX2133C14D4/8G In the last few days I have tried to turn the PC on, but it's stuck at bios page with A2 code.
	Intel i5 6600k - EVGA GTX970 SSC - HyperX 2x8GB 2666MHz - ASRock Z170 Pro4 - XFX P1-650G-TS3X