"I slipstreamed all DriverPacks as well as used nLite to add all the drivers from the Support cd."
That's probably why your HDD(s) are not recognized. I would highly recommend starting with a single drive set up as "JBOD". It will ease the load on your P/S, at the very least; maybe even save some hair follicles.
"1) Never use nlite for drivers."
Quoted from: http://forum.driverpacks.net/viewtopic. … 539#p48539
After solving that, it could be that some of the other "super-generics" already in DP's may interfere with the install. If only either floppy worked (symptom?), you would be out of the woods, now.
Another thought is to "clear" your QSC in DP_BASE.
"enable or disable QuickStream Cache (QSC), if not specified: yes
QSC = "yes""
Otherwise, i see power supply as a "one-in-three" possibility. The odds increase the older the P/S is and how "loaded" it has been. Sometimes you can see "burst" capacitors through the fan &/or rear (look closest to mobo power-harness - then by A/C input) with a flashlight. Power-Supplies in that condition do more to destabalize or even to damage anything connected (nor protected) to it than to simply power it. (google "capacitor plague")
Aluminum Electrolytic Capacitors are limited in lifespan; although every 10°C decrease in temperature can result in a doubling of it's lifespan. The "solid polymer" caps are sensitive to high-heat as well, the life-span math differs somewhat though. Ripple-current is another limiting factor. Think of "ripple" as akin to audible noise output from an audio amp.
Dust, debris & detritus are also bad news for electronics. Beware anything "plated" in and around electronics & airflow. A power supply is usually a steel "firebox" for a reason. Avoid Power supplies with aluminum casings; aluminum has a rather low melting-point!
I've seen some nasty holes "gouged" into the steel casings.
I've also seen that "borderline or worse" P/S proper diagnosis are regularly missed in stores, at least the ones that rely upon their "LCD P/S testers" that only measure the 5V line under load (As Dee Schneider @ the House of Hair would possibly say - "They're Crap!!")
It's the 12V line that is most demanding on a P/S.
Caution: Capacitors can also store a charge, sometimes far longer than would be expected; sometimes even a fatal charge.
An incompatible revision of "MediaShield RAID BIOS" could be a "long-shot" possibility.
Please quote your MediaShield version number for future reference.
PS: You are not alone. Here's someone with the same mobo with a similar issue, yet differing MassStorage HWid's.
see http://forum.driverpacks.net/viewtopic. … 591#p49591 and
http://forum.driverpacks.net/viewtopic.php?id=6266.