How easy is it to mess up changing a computers power supply?

I want to install a new graphics card on my computer but my computers power supply does'nt support any decent cards, so i intend to change the power supply unit.



i was just wondering if it is possible to plug a cable into the wrong spot while replacing a power supply unit. i've watched a few video tutorials and they all say that the cords for different things are different sizes ex. the biggest is for the mother board but i was wondering if any are the same, and if they are does it matter where they are plugged in to?How easy is it to mess up changing a computers power supply?
On a scale of 1 -1 0, installing a power supply is maybe a 3. If you've seen a couple of videos, then you should be good to go.

%26quot;i was wondering if any are the same, and if they are does it matter where they are plugged in to?%26quot; - no it doesn't matter.How easy is it to mess up changing a computers power supply?
It's pretty hard to mess this up. All things are different sizes and shapes (the connectors, I mean). If you ever liked messing around with a screwdriver, you'll do fine. Just remember which goes where and don't forget to plug in any of them! Good luck!How easy is it to mess up changing a computers power supply?
The difficulty in changing the power supply is in choosing the right power supply to buy. The main thing you need to worry about is your motherboard. There will be two connections from the power supply straight to the motherboard...

1) 20 or 24 pins. Probably 24 pins, but the connector on your power supply needs to match. Many power supplies have a 20/24 pin power connector (the last 4 pins slide off if necessary)

2) 4 pin or 8 pin CPU power connector. Most are 4 pin, but your power supply needs the correct connector. Again, many power supplies have a 4/8 pin connector, where 4 pins slide off if necessary.



Installing the new power supply starts before the old power supply is removed. Grab a piece of paper and pen and jot down EVERY connection on the old power supply. Note where EVERY plug on the old power supply is plugged into. During this, you can make notes about what type of plug it is, put it in your own words. Before you apply wall power to the new power supply, refer back to this list and double-check all connections.



Only other thing you need to worry about is the new video card. The new video card might require one or two power supply connections that the old video card did not. Make sure that the new video card is hooked up to the new power supply correctly before you connect wall power to the new power supply.



It seems a lot harder than it is. After you've done it, you will look back and think, well that was easy...