No boot after connecting second HDD

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Hello,I need help with 970 Extreme3 R2 m/b.
Freshly installed Win7-64, all drivers updated, Samsung SSD850 in AHCI mode.
When I am trying to connect second HDD ( SATA2), windows refuses to boot, stating "no bootable device". Disconnection of the HDD is not affecting this situation, I have to go through Windows Boot procedure to restore access to original boot.
Switching SATA  ports in various combinations is not affecting this fault. I used 2 different HDDs, which are working fine on Gigabyte M/B with exactly the same setup: bootable SDD with Win7.
Please, advise.

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Skala Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 01 May 2016 Location: Canada Status: Offline Points: 4	Post Options Post Reply Quote Skala Report Post Thanks(0) Quote Reply Topic: No boot after connecting second HDD Posted: 01 May 2016 at 3:34pm
	Hello, I need help with 970 Extreme3 R2 m/b. Freshly installed Win7-64, all drivers updated, Samsung SSD850 in AHCI mode. When I am trying to connect second HDD ( SATA2), windows refuses to boot, stating "no bootable device". Disconnection of the HDD is not affecting this situation, I have to go through Windows Boot procedure to restore access to original boot. Switching SATA ports in various combinations is not affecting this fault. I used 2 different HDDs, which are working fine on Gigabyte M/B with exactly the same setup: bootable SDD with Win7. Please, advise.
	Pupkin

wardog Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 15 Jul 2015 Status: Offline Points: 6447	Post Options Post Reply Quote wardog Report Post Thanks(0) Quote Reply Posted: 03 May 2016 at 4:28pm
	Was a single drive connected when you did the fresh install on this MB?

Skala Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 01 May 2016 Location: Canada Status: Offline Points: 4	Post Options Post Reply Quote Skala Report Post Thanks(0) Quote Reply Posted: 29 May 2016 at 2:20am
	No, I did Win installation with SDD only. HDD has been connected after full Win installation. AHCI mode was off during OS installation, by the way ( just forgot about it) - I have modified registry afterwards. If HDD should be present during Win installation, I can re-load OS, of course. However, if there is a way to do it by tweaking the registry, I would appreciate the advise.
	Pupkin