I bought a refurb HP from Best Buy and after about a month I started having all kinds of lock up problems. When you turn it on, the blue screen comes on that shows the F10, F11, etc options. The Numbers Lock illuminates and stays lit. The screen usually is stuck at this point and no keys work. I turn the tower off, unplug, hold the power button until the light goes out, open the side panel, take out the button battery, and reset the three circuit cards. I then insert the button battery, plug it in and start tapping the F10 button and then turn the tower on. The blue screen comes on and then allows me to start up. This happens at least twice daily. Does this sound like a Windows 7 problem, hardware, .........?????? I would love to chuck this thing out the window but financially I need to be frugal. Any hep would be great. Dave