Yeah, if your tower light doesn't come on that's a fairly reliable sign the PSU is dead. PSUs are not a difficult part to replace, even if you're a tech novice. The first thing to do is figure out what your current PSU is rated; no matter how appealing a cheap PSU is do not buy something that won't provide the power your box needs. As a general rule of thumb I wouldn't spend under $35 on a PSU even if I was on a strict budget. For a standard, modern 500w PSU expect to spend about $55-65 dollars. An unreliable power supply can significantly shorten the lifespan of all your components.
When it comes to actually unplugging the old one and installing the new one, check and double check that your box is unplugged first. And check again.
Then, if you're concerned about keeping track of the connections (And it's really much simpler than it looks) plug the new connectors in as you remove each of the old ones. Make sure none of the cables or unused connectors is brushing against a fan or heatsink before you close the case back up, and then start 'er up. Most PSUs have their own onboard switch to turn them on and off, but IMHO it's preferrable to leave that on and just unplug the thing from the wall as necessary.
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