Laptop power supplies can certainly be purchased separately. If you lost only a detachable cord it is an inexpensive replacement, but if you lost a cord including the pwoer adapter "brick" it is more expensive.
Computer
buy a new computer
buy a new computer throw away the old computer
you buy a new computer.
Your computer is broken, buy a new one.
then your disk drive is corrupted and will need repairing or have to buy a new one for 500-600$ at either Amazon or eBay or maybe Rapid Supplies dont chose eBay though
U can try emailing it to yourself, or putting it on a flashdrive and installing it on the new computer.
Please list the specs of the computer and what is being run on it and what the problem is. This can be tough in deciphering the answer to this particular question.
Turn on the power switch. Wiggle both ends of the POS cable, then re-boot your computer. If that doesn't help, buy a new one.
buy a new videocard :)
When you buy a new Windows XP computer, in what unit is the size of a typical hard drive measured?
nowhere.. sorry.. have to buy the book..