So here's my poor explanation ...

I have an AC Adapter for my laptop ... one end is hooked up into the power circuit (so say, the wall gives it power) and one end is hooked up into my computer.

The end going into my computer is very loose (The actual wire) and all bent up over 3 years of usage. I need THAT piece.

Do I have to buy A WHOLE NEW Adapter (for about $30 on eBay so it seems) or can I JUST buy THAT wire? And how would I determine this?

The wire itself says 125V-7A on it, for my Gateway 6018GZ Adapter.

Any help is appreciated!