Your PSU is more-than-sufficiently rated, lol.
You don't need any drives attached to update Maximus VII Hero BIOS with the USB Flashback method,
step-by-step video here. The locations of the BIOS Flashback button and reserved USB port are shown on page 2-11 of the
MAXIMUS VII HERO User Manual. In fact, it's probably best to remove all nonworking hardware during firmware flash, although it's not strictly necessary.
I'm just stating the obvious here to cover all bases (nothing personal because I don't even know you personally, lol, but flawed assumptions would be just as bad as insults) -
- each drive should be connected to the motherboard with a SATA signal cable and connected to the PSU with a SATA power cable (illustrated on page 2-8 of the User Manual)
- the Intel Z97 PCH provides six 6Gbps SATA ports (the "upper" three pairs of red ports, labelled SATA6G_1 through _6, illustrated page 1-39 of the User Manual)
- the ASUS-added ASMedia controller provides two 6Gbps SATA ports (the "bottom" pair of red ports, labelled SATA6G_E1 and _E2, illustrated page 1-40 of the User Manual)
- the ASMedia SATA ports do not support bootable drives, ATAPI/ODD drives (your CD/DVD drive), or hardware RAID
- do not change any BIOS settings or overclock anything at all (don't even run memory at its "rated" non-JEDEC settings) until ALL of your hardware works properly
- in UEFI/BIOS (under "PCH Storage Configuration", page 3-31 of the User Manual), you need to confirm your SATA Mode Selection is AHCI (not IDE, not RAID), Aggressive LPM Support is Disabled, SMART Status Check is ON, SATA6G ports are each Enabled (and Hot Plug is Disabled) - these are actually the default/factory BIOS settings - you also have the option of renaming the SATA ports but it's better to just leave them as-is until all your drives work
I think it's best to disconnect all physical drives except the SATA6G_1 boot/system drive (and maybe the CD/DVD drive, if needed to boot a disc) while troubleshooting this issue.
I think the best "final" setup would be your Samsung SSD in SATA6G_1, your HDDs in SATA6G_3 through _5, and your CD/DVD in SATA_6G_6, leaving SATA6G_2/_E1/_E2 unused, this way you won't even have to install ASMedia drivers (and never worry about OS/driver version conflicts, etc).
Swapping one not-working drive for another not-working drive over and over again will not accomplish anything. You should start with one drive known to be working - test and confirm it in another computer if possible - and methodically rule out failures in SATA ports or SATA cables (check for things like bent/broken pins, frayed wiring, etc).
Cover all the common faults: confirm that all your motherboard power inputs (24-pin EATX and 8-pin EATX12V) are properly connected, confirm system memory is properly installed and properly seated (DDR3 DIMMs, as described on pages 1-10 to 1-26 of the User Manual). Your chipset PCH (DH82Z97 chip) or VRMs might be overheating and require a repaste (which would void your already-expired ASUS warranty, lol) but only as a last resort after ruling everything else out - best to monitor motherboard/chipset temps for a while to see if they appear to be running hot enough to cause faults.
If you're not worried about recovering any data then you can just nuke-and-pave your system drive with a
clean Windows install. The bootable Windows CD (or USB) can even
completely wipe/repartition/reformat your hard drive, if desired.
Moving a Windows install to another computer is more complicated, partly because of hardware/driver issues and partly because of Microsoft licensing issues, but it is possible. You'll want a 64-bit OS, of course, since 32-bit won't be able to address all your memory and has increasingly limited hardware/driver support these days.
If your mission is just to get your machine working then you can circumvent all of Microsoft's annoyingly troublesome Windows licensing issues and product keys entirely and just install a linux.
Mint is a good choice for beginners and "normal" nontechnical people, and it can run as a "Live CD" or "Live USB" so you don't even have to perform a fixed install on a hard drive, excellent for troubleshooting hardware or getting the computer to work well enough to fix WinOS issues.
Recovering your personal data (photos, music, movies, documents, files, web history, whatever) from your nonworking drives is a complicated topic, if you need that data and don't know how to get it back then it's probably best to take your machinery into a computer shop.
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