Hi, Been experiencing this issue for quite some time now, however, not repeatedly. I have four internal HDDs: 1. 60 GB SSD for the OS. (Connected to Sata controller P0 on the mainboard) 2. 160 GB WD hard drive for installing apps. (Connected to Sata controller P2 on the mainboard) 3. 2 x 1 TB WD hard drives for backing up data. (Connected to Sata controllers P3 and P4 on the mainboard respectively) Controller P1 has my optical drive installed. Boot options have been set to: 1. 60 GB SSD 2. Optical drive At times when I power on the computer it takes a lot of time to go past the Windows startup logo screen (without the logo - would just say starting windows) and the HDD activity light keeps blinking for a long time. It takes about a minute for the windows logo to show up and then the system boots normally. I've also observed this activity light turned off totally during the Windows boot and the PC stays at a blank screen or the Starting Windows screen. About 2-3 times upon a manual restart it comes up with a message "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key" What could be the issue?