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It always seems to happen at the worst possible time. Suddenly, as you smoke out your last enemy something else starts to smoke - your computer's PSU. Usually the culprit is one of three things: blown capacitor, fuse, or fan. Luckily, today we're going to take a look at how easy it is to replace the former and get your rig back in good health.
The first thing you are going to want to do is determine the size of the fan(s) in your PSU, this can usually be inferred from the technical specifications or some obvious information - if your PSU has one large fan on the bottom it is most likely 120mm, if your PSU has one or two smaller fans they are either 80mm or 92mm. For this PSU, a Cooler Master, we will be replacing a 120mm fan. Alongside the replacement fan you will also need a good, low-torque "fat" Phillips-head screwdriver for removing the fan/grill, and optionally a longer, smaller screwdriver for removing the outer PSU screws (not pictured) may be desirable.
The next step is to unscrew the PSU from your case's back mounting plate - this should consist of four screws (only three pictured, one was already removed).
After you have the PSU removed from the chassis (you will want to disconnect all molex / power connectors before removal), you should locate the side with all, or the majority of the casing screws (should be four for your fan(s) and four for the housing).
Before you begin removing all of the casing's screws, be warned that you should peel off any warranty stickers (and save your broken fan) if you want to RMA your PSU in the future. Or, you can just go in guns blazing like I did:
To finally disassemble the casing, you will want to use a credit card (or screwdriver if you're "dangerous") and insert it into where the two halves of the casing meet. You should then gently pry the two halves apart while being careful not to touch any dangerous components (please be safe, wear non-conductive gloves if you need too, I don't want anyone to get hurt working inside of their PSU and I accept no liability).
You should then be presented with something similar to this:
You then should simply remove the fan by sliding it outwards. After you remove the fan locate the two-pin fan connector soldered to the PSU's circuit board and carefully disconnect it. You can now discard, or save the fan.
Now would also be the time to be amazed at how a little brushless motor can wreck so much havoc.
After that brief detour, you should then screw the replacement fan into the housing making sure to only screw in the four screws necessary for the fan. Then, you will need to take the new fan's molex/3-pin connector and carefully pull it out into the slot where the PSU's cables are routed while you slide the casing back together. You could also optionally change the fan connector to a 2-pin or even directly solder the red and black cables into the PSU (not recommended) for a tidy look.
Now, all you need to do s re-install the PSU in your chassis and reconnect your various power cables and you should end up with a perfectly working PSU (yes, the fan on the left is indeed an industrial blower).