Lately my computer has been locking up randomly, the strange part is when it does this the hard drive light goes solid and stays solid. Usually I can move the mouse, but thats about it, no escape sequence works to bring up the task manager. In addition to this it occasionally has trouble booting. After looking for bootable CDs/DVDs it fails to find the Windows installation. I tried replacing the hard drive and Ghosted over my Windows installation, but this didn't fix it. I ran MemTest through one pass and it didn't find any RAM problems. Does this seem like a software issue, do I need a new motherboard, or is there something else I should do?