I’ve done numerous upgrades to other S2’s and S3’s without any problems. I’m now trying to upgrade my TiVo HD to a new 500g WD Green drive and I'm having a problem. . Took old drive and did Winmfs backup. . Took new drive and did Winmfs restore. . I then ran "Wdidle3 /D” on the Green drive to get past the “power up” screen. . The TiVo boots to the introduction screen without any problems. . I then hit the TiVo button on the remote. . The TiVo goes to Green Screen for 10 seconds and reboots. . It then starts a Green Screen, reboot loop (2 1/2 min cycle) until I pull the plug. . When I plug it back in it only does the Green Screen, reboot loop, no introduction screen. I then took another brand new drive and repeated the above steps and the same thing happens, Green Screen/reboot loop. I put the original drive back into the TiVo and everything is running fine, so I don’t think it’s a hard drive or power supply problem. I’ve successfully put the same model Green drive into my S3 following the same steps without a problem. I’m not sure what the problem is, anybody have any suggestions?