I booted up this morning and same as usual, went to brush my teeth, wash etc. while it loaded windows. When I got back, there was a black screen, no icons save for a white taskbar and the windows (start) symbol. When I moused over the start symbol, the win7 eggtimer came up. Nothing (ctrl+alt+delete, left or right mouse clicks) did anything so I had to go for a hard reboot.
2nd time of booting, same thing happened. I have a G15 keyboard that doesn't get power until after the boot process so I missed the Safe Mode option.
After digging out my ps/2 keyboard, I restarted and got into Safe Mode. Everything's perfect so I rebooted and tried again.
4th time of booting, Windows loads perfectly.
Does anyone know what might have happened and how I can prevent it in future?