Having trouble installing a fourth Internal HDD

Well I already have 3 internal HDD's installed and I gave up on trying to install a fourth one a month ago.

They are all SATA drives, 1tb each. From what I recall the last time I tried to install it I got this error message.

Code:

Disk boot failure, insert system disk and press enter.

I insert the disk and press enter and it keeps repeating the same message over and over.

As soon as I unplug the the fourth HDD, it boots fine. Help?

 

That message means the PC is trying to boot off the wrong HD. With all four HD in the machine does hitting F12 during the BIOS/Splash screen give you the option to choose which HD to boot to? Not a real fix but just want to see if the PC still sees all HD while trying to boot off the wrong one.

 

Just hooked it up a few minutes ago & it booted with no problem. IDK why it did in the past.

 

I don't know why either. Technically, the PC should always try to boot off the SATA 0 HD but sometimes adding drives causes problems with the boot order.

Post back if you have any further problems but we'll leave well enough alone for now.