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I am using Siemens S5 cpu 922. When installed in rack and powered on, both the Run and Stop LED don't turn ON. The only light that is turned ON is BASP. I have tried removing all cards but this doesn't help. I tried changing the CPU with a spare 922, which I believe is healthy and is in new condition, but the same problem persists with this CPU. I also tried a CPU 928 but with this also, both Run and Stop LED remain OFF and BASP remain ON. From this I concluded that their must be a problem with Siemens rack. Since I don't have a spare rack I am not able to verify that.