Every once in a while after trying to start my Dimension 8400 it does not start all the way up. There is just a black screen and the sound of the computer is a noiser than normal like more fan activity or something.  I then have to hold in the power button to turn it off and then restart up which time it always starts back up normally (at least so far).

 

Usually I do not see any error messages but the last time there was a  message that  Windows was unable to load and this may be due to a recent change in hardware or software. Before I could read anymore it restarted normally and Windows loaded properly.

 

The only hardware changes I have made were installing a Nvidia 7800 GTX OC 256 MB graphics card that I bought from Dell and was assured of system compatibility and had professionally installed also. The driver is also up to date.

 

Does anyone have any idea what could be causing this? I have had the power supply replaced before due to the "unexpected shutdown" problem with the "blinking amber light", but that would occur while the computer was already booted all the way up with Windows loaded and running properly and you would return to find the computer in an unresponsive state with the blinking amber power light. Maybe these two problems are related somehow or it is something entirely different. Any advice is greatly appreciated.

 

Thanks,

Jon