HDD light blink constantly, PC gets slow

[imabdullahghani]

I had a PC (Core 2). There was the problem of constantly blink of HDD light and PC was very slow.
I bought new PC Core i5 and install the same RAM and HDD from olde pc. And now the new PC has the same problem.

 

[jay32267]

I think I would replace the HDD...as I think that's the #1 suspect.

 

[imabdullahghani]

I think I would replace the HDD...as I think that's the #1 suspect.

I replaced the HDD, but still it is going through the same problem.