Some kinds of freedom are more equal than others.

I've had EnableUlps set to 0 for quite some time (Crossfire related problem with 1 card randomly going to 0% load).  I can confirm that this will NOT allow you to start mining on a GPU that doesn't have a monitor attached.

My solution.  My monitor has 3 inputs.  I plug my 2 cards in to it.  1 DVI 1 DVI-VGA.  Start mining and overclock 1st card, hit switch input, start mining and overclock 2nd card.

thanks for the info! let me know your bitcoin address and I will send you the refund for testing.

what are the limits in CCC for the HIS?

*************\ClockTweak>clocktweak.exe -a3 -y -c850 -m300
===============================================================================
                ClockTweak v0.7.4b - bitcoinX.com/clocktweak/
===============================================================================

Set values - starting.
 Adapter #3:
  setting core speed: 850 [MHz]
ERROR: write_values: core speed 850 could not be set (1): False

D:\****************\ClockTweak>

===============================================================================
                ClockTweak v0.7.4b - bitcoinX.com/clocktweak/
===============================================================================

Exploring up to 20 adapters:
A.#:0  r:0 ID:-591551232  Name:"ATI Radeon HD 5800 Series"  Active:0  GPU:0
A.#:1  r:0 ID:-591551232  Name:"ATI Radeon HD 5800 Series"  Active:0  GPU:0
A.#:2  r:0 ID:-591551232  Name:"ATI Radeon HD 5800 Series"  Active:0  GPU:0
A.#:3  r:0 ID:-592234880  Name:"ATI Radeon HD 5800 Series"  Active:1  GPU:1
A.#:4  r:0 ID:-592234880  Name:"ATI Radeon HD 5800 Series"  Active:0  GPU:1
A.#:5  r:0 ID:-592234880  Name:"ATI Radeon HD 5800 Series"  Active:0  GPU:1
A.#:6  r:-1 ERROR: explore_adapters: adapter  6 could not be initialized (-1)
A.#:7  r:-1 ERROR: explore_adapters: adapter  7 could not be initialized (-1)
A.#:8  r:-1 ERROR: explore_adapters: adapter  8 could not be initialized (-1)
A.#:9  r:-1 ERROR: explore_adapters: adapter  9 could not be initialized (-1)
A.#:10  r:-1 ERROR: explore_adapters: adapter  10 could not be initialized (-1)
A.#:11  r:-1 ERROR: explore_adapters: adapter  11 could not be initialized (-1)
A.#:12  r:-1 ERROR: explore_adapters: adapter  12 could not be initialized (-1)
A.#:13  r:-1 ERROR: explore_adapters: adapter  13 could not be initialized (-1)
A.#:14  r:-1 ERROR: explore_adapters: adapter  14 could not be initialized (-1)
A.#:15  r:-1 ERROR: explore_adapters: adapter  15 could not be initialized (-1)
A.#:16  r:-1 ERROR: explore_adapters: adapter  16 could not be initialized (-1)
A.#:17  r:-1 ERROR: explore_adapters: adapter  17 could not be initialized (-1)
A.#:18  r:-1 ERROR: explore_adapters: adapter  18 could not be initialized (-1)
A.#:19  r:-1 ERROR: explore_adapters: adapter  19 could not be initialized (-1)

valid adapters: [0, 1, 2, 3, 4, 5]
gpuAdapters: [0, 3]

Compatible GPUs found on these adapters:
Adapter#:0  ID:-591551232  Name:"ATI Radeon HD 5800 Series"  Active:0  GPU:0
Adapter#:3  ID:-592234880  Name:"ATI Radeon HD 5800 Series"  Active:1  GPU:1

Reading data:
Adapter#:0 Temp:63 Load:91 Fan:58 Level:2
CoreL0:157 CoreL2:900 MemL0:300 MemL2:300 mVoltL0:968 mVoltL2:1118

Adapter#:3 Temp:70 Load:96 Fan:62 Level:2
CoreL0:157 CoreL2:725 MemL0:300 MemL2:1000 mVoltL0:950 mVoltL2:1088

Go to registry and disable Ulps:

 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Cl ass\{4D36E968-E325-11CE-BFC1-08002BE10318}]

 and change "EnableUlps" to 0 under the 0000 and 0001 or 0003 keys.