Question Pc won't load after installing hdd

[ahmed_potato]

I have 2 hdd which i used to have windows on one of them so i bought an ssd to have a better performance i used the 128 gb ssd with the 320 gb wd hdd and everything was fine but when i came to use the 500 gb wd hdd with the ssd i can't boot for some reason and i just get flashin underscore
Even though when i used the 320 gb hdd with the 500 gb hdd everyting was running propely
Some of you might say that it's a boot order or something but i changed that to the ssd tobe the first one

 

[rgd1101]

did you install windows on the ssd with the 320wd hdd attach?

 

[SkyNetRising]

I have 2 hdd which i used to have windows on one of them so i bought an ssd to have a better performance i used the 128 gb ssd with the 320 gb wd hdd and everything was fine but when i came to use the 500 gb wd hdd with the ssd i can't boot for some reason and i just get flashin underscore
Even though when i used the 320 gb hdd with the 500 gb hdd everyting was running propely

From your description one would have to conclude:

windows is installed on 320GB drive.​

Then obviously you can't boot into windows, if 320GB drive is removed and you use 128GB and 500GB drives.

Can you show Disk Management screenshots ?

when you boot with 320GB and 128GB drives connected and​

when you boot with 320GB and 500GB drives connected.​

(upload to imgur.com and post link)​

 

[ahmed_potato]

Yes

 

[ahmed_potato]

I found new info
So after testing the hard drives for a looong time
I've noticed that if i boot the ssd alone
It gives me a message that says "Please reboot and select a proper boot device"
But when i install the 320 gb hdd it boots normally
Im sure that windows is installed on the ssd
So that mean the 500 gb hdd isn't the problem

 

[SkyNetRising]

Please show screenshots requested in post #3.
This will help in diagnosing your problem.