Can't use 2 HDD'S!? HELP PLEASE!

[TERraTRIIx]

So one day I was using my PC then it shutdown,
and when it booted up, my boot drive wasn't being picked up by the Motherboard.
So then I swopped around the ports, and then my Boot drive was picked up by
my Motherboard, but my secondary HDD wasn't being picked up?!

If I swop around ports I can easily make one or the other picked it, but both can be picked up
in all of the ports, so there aren't any broken ports...
I have no Idea how I can fix this, and I need the data on my secondary HDD,
but I can't access it without an OS...

Please help, if you need any more information please ask!

Motherboard - ASRock pro3
Memory - 8 GB 1333 Kingston
CPU - I5 3570
GPU - MSI gts 250
PSU - 450W Thermaltake
Boot HDD - Western digital (320GB)
Secondary HDD - Seagate Barracuda (160GB)

Thanks in advanced Thomas.

 

[Ironsounds]

Hello... does the problem follow your Data cable or the power connector to the hardrives? Mark your connections 1 and 2 and try the four different possible combinations, 1-1 1-2 2-2 2-1... Did you see a pattern between these tests with the BOOT drive?

 

[smorizio]

make sure in the bios all the sata ports are on and set to achi mode.

 

[TERraTRIIx]

There is always power to the drives, but the connection doesn't come up.
By 4 different combinations, what do you mean? the ports which they are plugged in?

 

[TERraTRIIx]

make sure in the bios all the sata ports are on and set to achi mode.

I don't see how that can be the problem, each HDD works in whatever port,
they just don't work together..

Thanks anyway though.

 

[TERraTRIIx]

Well I restarted my PC, and suddenly the HDD was found, and all was well???
Does anyone have a clue what may of caused that?