question on Inspiron 1520

[FrEaKy]

System boots up, gets to post, works fine.
Second it is just about to finish post, the screen goes almost 100% black. If I try to get into BIOS, it goes almost 100% black again. This is ONLY WHEN ITS PLUGGED IN THROUGH AC.
If I dont plug it into power, it boots up just fine and goes into BIOS just fine, but only when its plugged into the AC adapter does it screw up.
I tried the, boot the system into Windows than slap in the power connector, and it instantly goes dark. If I unplug the ac, it will stay dark until I reset the system than it works again as long as its not plugged in.
I tried removing the battery and booting only with the AC, and it goes dark.

As long as the power cord is plugged in... in any fashion.... the system goes dark.

Any ideas?

 

[erkzh]

faulty power cord. too much or too little voltage or something. see if you can try a friend's power brick?