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.

The colours appear distorted and flicker very quickly between offset R, G and B. Only the colour white appears stable. The more black on the screen, the more pronounced the flashing and cycling is.

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