Replacing a power supply is not dangerous. Of course you have to disconnect the PC from the power supply during the conversion work. The PC power supply is housed in its own housing, which of course can not be opened under any circumstances, which would be very dangerous.
Is it dangerous to swap a PC power supply?
Before you open the PC case, you should always earth (for example, by using a handle on the metallic radiator) to avoid potential damage from electrical charges.
Avoid possible anger due to short cables
Since the ATX power supply units have standardized dimensions, a change is usually not a problem. The exchange is done in a few minutes. A cross-slot screwdriver is sufficient as a tool. Before buying a new power supply, you should always measure the cable length of the old power supply.
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The cable harness for the mainboard plug is only 30 cm long with many a cheap power supply, which can be too short for many housings. Good power supplies should provide twice as long.
Buy a power supply with enough power
Power supplies are divided into different Watt classes according to their performance. But how much performance do the processor, graphics card, and all the other components in their own computer maximize?
A question that perhaps PC experts from the Stegreif can answer, all others should advise instead, rather to rely on an online calculator, as it is about be quiet! Below. Click on "PSU-Calculator" and choose "Quick Mode".
Now you essentially specify process location type, graphic card and number of drives, and the online calculator makes you several suggestions for suitable power supplies. These are only from the supplier's range, but you get a glimpse of how much power you need.
As a rule, the power supply is installed at the top of the PC housing. Loosen the mounting of the right housing cover as seen from the rear. Before you can remove the old power supply, it is necessary to remove all plugs from the old power supply. This includes the 20-pin or 24-pin connector of the main board (EPS12V), as well as the 4- or 8-pin connectors for the CPU power supply.
These plugs on the mainboard have small hooks, which must be pressed down before the plug can be removed. This is followed by the connectors for all drives, the graphics card and possible enclosure fans. Remember exactly how many of which plugs are used. If necessary, you should note this on a note.
If all cables are disconnected, you can loosen the four mounting screws on the back of the PC housing, and then remove the old power supply. With some computer configurations, the CPU cooler can become a problem, because it can block the way. Then you only have the option to remove the CPU cooler or, if that is not possible, temporarily expand the entire motherboard.
The new power supply is now installed in the reverse way. Make sure that you do not install the power supply unit upside down: the four screw threads for mounting on the housing make this easy to see. If you have a power supply with cable management, you should attach the cable strips to the power supply before installing the power supply.
Reconnect the motherboard and all other components with the necessary power connections. Make sure that the cable is firmly seated to prevent bad contacts.
Concealed cables should be combined with cable ties so they do not block fans. Then close the case and restart the PC.
Plug in the old power supply
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Install and connect the new power supply
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