i have had my dell xps 1645 for around a year now i bought it off a website second hand last night it just shut down now when i turn it on all i get is a flashing mute light and the volume up and down are solid lights.

My AlienWare 51 continues to reboot after being logged into the OS for 5 minutes. I purshased a new PSU, a new MotherBoard(same model as the one that comes with the X51) I puled each Graphic Card one at a time, same with the RAM. I even re-installed the OS.

I just replaced a hard drive in a Dell 8300 and I'm getting ready to reinstall windows 7 back in. I also need to reset the administrators password. My sister-in-law has no idea what the old password is. I'm not sure how to change the password. Help Please