Since they gave you the wrong CD (or you got the wrong model) back to Dell for the right CD.
However the HDD could have failed. Did you try a new drive?
And your post's detail is short. Any guess I have may be wrong.
My 1545 dropped dead, literary, so it lost its brain, the OS
I took the harddrive out and checked it, the first partition is now "unformatted", the second one is still good, which is the recovery.
When I powered it up, it gives me the option to reinstall OS. When I follow its instruction, it will tell me there is no driver for the harddrive, and ask for the DELL driver CD that comes with 1545, I put it in but it complains it is not compatible. I searched the recovery partition, there are 100s drivers there, and I haven't found any match yet.
Now, should I format the first partition as NTFS from another PC? Or is there any other suggestion?