cgminer BSOD on Startup

[renisel2]

I am trying to put together a mining rig and have been having an issue with cgminer crashing on startup.  My system is as follows:

MB: Gigabyte GA-Z68MA-D2H-B3
CPU: Intel Celeron G1620 CPU
RAM: Patriot 2x2GB 1333MHz DDR3
PSU: Corsair AX1200i
GPU: I have tried one XFX R9270ACDFC and three different XFX FX795ATDFC
OS: Win7
Catalyst 12.8, APP SDK 2.7

I have tried a bunch of different batch files, but am currently trying to get it to just start up without crashing, and have removed all extra options.  So it looks like this:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -I 12 -o stratum+tcp://... -u x -p y


I have another machine that can mine at about 600 kH/s with the 7950s and around 430 kH/s with the R9 270 with no issues (it becomes unstable when I try to run two cards at once, but that's an issue for another time).  So there doesn't seem to be a problem with any of the GPUs individually.  If I don't start cgminer, I don't see anything odd with the behavior of the machine.  When I do start it, it opens the command window, shows the cgminer version info, and then either goes to BSOD or a black screen from which it won't recover.

Can anybody help me troubleshoot this?

[SheepOnDrugs]

Reinstall your drivers.

[renisel2]

Reinstall your drivers.

I've tried that several times.  I've also tried all permutations of Catalyst 12.8 vs 13.1 with APP SDK 2.7 vs 2.8.

[SheepOnDrugs]

What settings are you using exactly for cgminer?
Seems like you're pushing your GPu too much.
You could also try using Linux.

[renisel2]

What settings are you using exactly for cgminer?
Seems like you're pushing your GPu too much.
You could also try using Linux.

Right now, the settings are just what I showed.  It's just the mining pool, username, password, intensity=12. 

On my other machine, all four of these cards can run overclocked and with I=20 with a few rejections but no hardware errors or crashes.  So I would think the I=12 with no overclocking should be well within their capabilities.  I have tried bringing it all the way down to 8 with no change in the result.

I spent 2 days trying to get this same hardware running with Ubuntu, but was having issues with cgminer crashing there too.  I went to Windows because I had already gotten one Win7 machine mining stably, and mistakenly thought that if I used the same video cards, drivers and OS, I could expect similar results.

[SheepOnDrugs]

Can't really help you with the BSOD but what problems did you have with Ubuntu?
Could help you if you want.

[BrewCrewFan]

What exactly happens? Does it freeze? does it just open then close?

I would try adding the TC line in and start @ 8192 for starters and work up from there. It could also be a case of the program trying to set the TC way to high. I know for a few of my setups it tries to set @ 14k+ and then I get some kernal error lol.

[SheepOnDrugs]

BTW. you also should delete the scrypt*.bin file everytime before you change your cgminer settings.

[renisel2]

Sort of figured this out after I got home from work.  I have this in a milk crate type of setup, with the graphics card connected via a ribbon pciex16 riser, and the risers appear to be the problem.  I have 5 risers from 2 sources and had tried 2 from each source, and was assuming that they can't all be of such low quality.  But when I plug it in directly, it at least doesn't crash.  I can only get about 150 kH/s if I want to keep it stable, whereas the exact same card (same physical card, not just same model) will be stable increasing the intensity to the point where I get over 500 kH/s without touching any other options in the .bat.  But that's a different issue for a different thread.

Thanks to those who posted their thoughts.