Eventually I dropped all the way down to 2400mhz and it booted. I should give this zero stars if I could. This is what mine looked like after wearing them for 6 days. Die Größe 39/40 von crocs war mir immer etwas zu kurz. The originals fit snug and I broke them in as can be seen in the photos. I dont think Ive used a keyboard with such a great tactile feel and satisfying audible feedback since my original IBM AT keyboard. Good material and steady, very happy with the product. But same thing. Please kindly give my review a helpful vote if you found it useful. Provides some background on the first couple of chapters but after that it sucked.