Hi. I have a Mac Pro 1.1 2x2 GHz Dual-Core Intel Xeon - now with 2Gb 667 MHz DDR2 FB-DIMM. 1 month ago it started to restart suddenly. now it is restarted even in single user mode. I have tried everything. PRam. Single User, Safe Mode. and it restarts always. I may have corrupted the system, now...