Hi Everyone

I am having a really annoying problem with litecoin mining.

I have a PC with these specs (And other variants to test hardware):

Core2Duo 1.8ghz or Intel 1366 1.86ghz Xeon Processor
Intel 975bx Chipset Mainboard or Gigabyte X58A Mainboard
Corsair 1050watt PSU
Seagate Hard disk
2 x 5870s & 1 x 7970
or
1 x 7970 & 1 x 5870
or
1 x 7970 & 1 x 7950

Software:

Windows 7 64bit
Windows 8 64bit
cgminer 3.11, 3.0,2.11, 2.10, 2.9, 2.8, 2.7, 2.6, 2.5 2.4
AMD SDK 2.8 and above
AMD Video Drivers 12.8, 13.1, 13.4


I simply cannot run more than one card plugged in, or CGminer runs hundeds or thousands of HW errors, and doesn't submit any shares.

As you can see, I have tried so many different combinations.

When I run cgminer 3.11 and mine bitcoin, all cards hash perfectly. 430mh/s from the 5870s each, and just a touch over 700mh/s from the 7970.

I have even tried underclocking the cards heaps to try and get them to at least run, but nope, massive amounts of hardware errors.

Most of the time CGminer crashes just as it tries to load.

Few other points:

- VRMs aren't getting hot.. the cards don't even start
- Each card works fine if installed on its own
- Still hardware problems if cards are installed but disabled in cgminer

Can anyone help me?