Hi,
Primary IDE Master, Primary IDE Slave
These show "None" because you don't have an IDE hard drive yours are SATA. ( different type )
SATA2. Samsung HD753LJ
This looks to be your hard drive.
What I cannot understand is why it is located in the SATA 2 port and not SATA 1.
SATA 3 & 4 are your DVD & CD drives.
Switch off at the wall - leave the plug in.
Take the side panel off and touch the bare metal chassis to discharge any static in you.
Take a look at the motherboard - there will be wires coming from the DVD/CD Drives and hard drive and connecting to the motherboard.
There will be 4 SATA connections on the board.
3 are accounted for.
Is there anything in the SATA 1 socket?