I am working on a computer about 1 year old. The people say lately it often reboots at night when no one uses it. It will then hang on the splash screen until it is powered off then on. It has only shut down like that once while they were using it. I go into event viewer and the only "warnings" are occasionally for "Leapfrog Connect Device" and "MSSQL$MicrosoftSMLBIZ". I have run Hard drive tests, Ram tests and nothing is failing. They say that they have seen the "blue screen" a couple times. It is running an upgrade of Windows XP Home. It is running a Dual Pentium 4 2 GHZ with 2 GB of RAM. Any ideas?