Power Supply's are an SMPS used for personal desktop computers.
Switched-Mode Power Supply, Switched-mode power supply - Wikipedia, the free encyclopedia
The expensive gamer Power Supply's may have a circuit breaker in them, and will reset, but the generic Power Supply's used in pre-built computers have no such option, kjaks1.
The SMPS' used now are ATX models.
Hasn't been a fuse type that I remember, since the old AT style of Power Supply's, and very FEW of them.
Capucho27, if you do not own a multimeter suggest you purchase one.
Average cost is around $8 to $12, and available in a multitude of stores.
An auto parts store is but one example. Analog or digital is fine.
Test the Power Supply.
There are 3 main voltages that you will be testing for;
A) 3.3 Volts (DC)
B) 5 Volts (DC)
C) 12 Volts (DC)
Your Power Supply converts your house, or business AC power into DC power.
Depending on what country you are in your AC power may be 100, or 120, or 220 Volts AC.
This is converted into the low DC voltages listed above.
In comparison two D cell flashlight batteries store 3 Volts DC.
1) Orange insulated wires carry 3.3 Volts
2) Red wires carry 5 Volts
3) Yellow wires carry 12 Volts.
(All are DC Voltage)
4) ALL Black wires are Ground wires.
A) Computer on a table, computer OFF, computer case open, computer plugged into power. TOUCH the metal frame (Unpainted) of the open computer case, to relieve your body of Static.
B) Look for an unused 4-pin standard Peripheral power cable.
(Misnomered as Molex power cable. I also refer to it as 'Standard', because there is a 4-pin Small Peripheral power cable. Used to be used for Floppy Drives. Is mostly used now for Card Readers), All about the various PC power supply cables and connectors
Untangle the cable, ease it to the outside of the case.
Try to position it so you can easily grab it again.
Attach the red Positive probe lead to the + socket hole in the multimeter.
Attach the black Negative probe lead to the - socket hole.
Turn the Function knob to DC Voltage.
If there are just symbols, set it to the - dotted line over a solid line symbol.
If there is more than one DC Voltage scale, set the Function knob to the 0 to 50 Volt scale.
Turn the computer on.
Hold the 4-pin standard Peripheral power cable's connector, in one hand.
Also use the fingers of that hand, to hold the red Positive probe lead's tip, into the socket hole with the Red wire.
Use the other hand to insert the tip of the Negative probe lead, into ANY of the two socket holes that have a Black wire.
You should be reading 5 Volts (DC), or VERY close.
Remove the probe leads.
Place the Positive probe lead tip into the socket hole of the Yellow wire.
Negative probe lead to a Black wire again.
You should be reading 12 Volts, or VERY close to it.
If you get a full 5 Volt, and 12 Volt reading, come back and post.
I will then guide you in testing the 3.3 Volt power rail.
Older Processor's used the 5 Volt power rail.
Now Processors have approached closer to saving power, by using less power, and the 3.3 Volt power rail is used.
(No Processor operating, no computer)
Using the above method will PROVE the Power Supply is T-O-A-S-T.
Then you can go on to replace it, and have your computer back again.
What is the computer manufacturer name, and Model Number? (For HP it is Product Number. P/N in the white Service Tag )