Re: upgrade the dell inspire 518
yes it will work. it's an ATX PSU. 90% of the psu's you find on sites like newegg or tigerdirect are all ATX. doesn't matter if it's a different psu, 90% of the time it will be ATX so it'll work. Use the search feature next time to see if you're question has already been asked/answer.
A notice to EVERYONE who has posted here with a computer problem, I highly encourage you to keep current with the forums, even if it's browsing for 10-15 minutes during lunch, or before you go to bed at night. There are many things that you can learn and apply to future issues. My goal is to help people get to a point where they can use their own knowledge to help themselves, and others.
Also please use the search button. You've got a 50/50 chance that someone's asked your question and we've answered it.