I have a Lenovo Twist (S230u). When I boot it up, it shows the LENOVO logo, then under that it says ''To interrupt normal startup, press Enter''. Then it says ''2100: Detection error on HDD0 (Main HDD)''. How can I fix this? I tried taking out the HDD and putting it back in. There are usually three items in the boot menu: ATA HDD0 (Hitachi), ATA HDD2 (Samsung) and PCI LAN. But sometimes the first one goes away and there is a 2100 error. Even when there is no error, it still does not boot to windows, just goes to the Boot Menu.