I have a system with windows 7 and 8.1 in two separate drives. Few days ago I booted from 8.1 to 7 and there was no sound from integrated sound card, though I managed to get it from HDMI monitor. When I tried rebooting to 8.1 I faced an automatic attempt to repair and a 0xC000021a error. Tried to boot to windows 7 and only got black screen with active cursor and no system sounds. Furthermore, after a windows 8.1 failure the drive with it disappears from bios until pc is power cycled.
There are no system restore points in 8.1 and restoring the w7 did not help.
Tried with no luck:
renamed avg files in system32/drivers as these are the ones where safe mode stucks.
safe mode results same situation as normal boot
startup repair
A hardware problem is possible but I have no idea how to diagnose it.
Thanks in advance for any help.
There are no system restore points in 8.1 and restoring the w7 did not help.
Tried with no luck:
renamed avg files in system32/drivers as these are the ones where safe mode stucks.
safe mode results same situation as normal boot
startup repair
A hardware problem is possible but I have no idea how to diagnose it.
Thanks in advance for any help.
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