Samsung 840 Pro not recognized in BIOS after format

Hey all, in dire straights here. My Samsung 840 Pro 128GB is not being recognized in my MSI GX60 BIOS


Here's the situation:

Have MSI GX60, running Windows 7 Ultimate 64 bit on a Seagate 7200RPM 500GB drive in AHCI mode.
Installed Samsung 840 Pro 128GB into second SATA-III slot
Booted computer, far slower than normal. Upon boot, drive works fine.
Format drive in DIsk Management (was from another machine of mine) and wipe the system reserve and main partition (from Samsung *only*)
Not sure if I saw the drive in My Computer after that, however I assigned it a drive letter in Disk Management when formatting.
Went to install EVE Online SISI launcher (test server build) to the drive as I want to use it with a few of my games. Drive not showing up.
Boot into BIOS, drive no longer recognized by the hardware. Seagate shows up, Samsung not showing in either drive listing or boot options.
Pull Seagate, leave Samsung, and boot into BIOS again. Samsung shows up this time (!!!)
Replace Seagate in secondary slot, leaving Samsung in primary (they aren't labeled, I'm just calling "primary" the slot where the original hard drive was placed), boot into BIOS
Samsung no longer showing, Seagate showing as primary.
Booted into windows, Samsung not showing in Device Manager, Disk Management, or My Computer.

Have tried drive in external adapter on same laptop, recognizes fine. Tried in different laptop, recognizes fine.

I know both slots work because they both boot my Seagate. I know my BIOS supports two devices as it did once already (before I formatted the drive).

Also, I'm just trying to use it as a blazing fast storage drive for my more demanding games, not a boot drive - I can deal with Windows taking 20 seconds to boot up from a platter drive.

Kind of at a loss as to what to try next, have been googleing variations on "Samsung 840 Pro not recognized after format" for about an hour, have run Microsoft Fix-It tool for AHCI drivers, made sure my BIOS is AHCI mode, etc etc. I would HUGELY appreciate any assistance.

If I figure it out before anyone replies, I'll update with the steps I've taken, as I've seen 3 threads out there (not here) for this similar issue, and none of them have posted resolutions or status updates.

 

If you had an OS on the Samsung prior to installing it to another machine that has a working OS then you might need to clean the drive to remove all residual boot info.

Try this: Open a command prompt with run as administrator (right click the icon).

Type the following commands {omitting my comments} and Enter key each line:
DISKPART
LIST DISK
SELECT DISK n {n = number of the disk that you want to bring focus to, i.e., the Samsung SSD in the list}
DETAIL DISK {verify that the details represent the drive you want focused, if it is continue, if not then STOP}
CLEAN {~30 seconds to complete}
EXIT

------

You can now create and format drive partition(s).

Regards

EDIT:

Oops, forgot the LIST DISK command, it is now added in above. Sorry about that - you wouldn't have known which drive number to (SELECT DISK n) without that command ahead.

Also, I should add, if there is any data on the drive that you want to clean then make sure that it is backed up as it will be inaccessible afterwards.