G-Series Gaming Keyboards

[sifr]

Hi...I've had a G19 (along with a G13, G9, and G930) for the past year or two, and they've worked great.

However, today I just replaced my old computer with a new one:

Motherboard: Asus Sabertooth P67 rev B3

Graphics card: Sparkle GTX580

RAM: 8GB (2x4GB) Corsair Vengeance DDR3 PC1600

Boot drive: Corsair M4 128GB SSD

Power supply: Corsair 850W

CPU: Intel Core i7-2600 3.4GHz quad core

OS:  Win 7 Home Premium 64-bit

The only thing that changed was the hardware.  That's the same OS I was running on the old system (of course, it's a fresh install on a new drive...the SSD replaced my old boot drive).

Everything's fine, except that for some reason, the lights on the keyboard are flickering really rapidly, and every once in a while, the keyboard randomly registers F3 (search), and will also randomly full-screen a window I'm in. 

Absolutely nothing has changed in terms of where the keyboard sits, or the cabling, or anything else.  The only thing that has changed is the computer it's connected to.  All my drivers are up to date (verified by Driver Detective)...that's all the logitech drivers, all the chipset drivers, and so forth.  Win7 has been updated to the latest patches and service packs.

I even tried uninstalling the newest game center software and installing the legacy logitech software, but the same problem persists.

I've also tried switching USB ports (I've got 12 to choose from on this motherboard...8 rear USB 2.0, 2 front USB 2.0, and 2 USB 3.0), but the problem exists in all of them.

I also updated the P67 to the newest stable BIOS with no success.

It really seems as though it might be a compatibility issue between the keyboard and the new motherboard, but that doesn't make any sense, since this motherboard uses the same Intel 6 series/C200 series chipset USB controllers as my old system, which was also an Asus motherboard.

Has anyone ever seen a similar issue?  If so, how did you fix it?

[kgober Logi Guru III]

it may merely be a coincidence that this started happening about the time you upgraded your system.  I recall seeing other posts here about flickering on G19's, and it was related to either the power connector or it involved changing the tension on the internal parts by pressing certain places on the keyboard's case, or loosening certain screws.

I don't have a G19 so I didn't pay a lot of attention, but if you search the older posts in this forum you may find some useful posts.

-ken

[sifr]

Actually, I fixed it.  Turns out it was the USB extender cables I was using.  Even though the max length for USB 2.0 is 16.4 feet, and I was well under that (10ft total, between the built-in cables and the extenders), apparently the new system is overly-sensitive to voltage fluctuations on USB.  Removing the extenders eliminated the problem.

Also, it couldn't have been electrical noise on the extenders, as they're well-shielded, choked, and again, the symptoms weren't present on the old system.

Additionally, the flickering wasn't a hardware issue; changing the color would cause the flickering to worsen or lessen, or disappear altogether.  Seems it's just a problem with particular colors.