I recently built a new machine, Gigabyte P55 motherboard, Core i5 @ 2.8 GHz, 4GB ram, ATI 4650, Seagate Pipeline HD 500GB hdd, 750W Corsair PSU. Installed Win 7 x64 and following the "Completing Installation" stage of setup, the machine reboots as usual and then gets to the "Starting Windows" with the Win 7 logo getting brighter and dimmer then all of a sudden the HDD indicator light flashes and the Win 7 logo stops being animated and will stay there for at least 30 min (at which point I gave up). I put an older Seagate barracuda drive in its place (160GB SATA 1.5 Gb/s) and loaded the same OS on it and it will boot fine. I'm having trouble diagnosing the issue. I ran SeaTools on the Pipeline HD drive and it passed all the tests. Please help. Thanks in advance.