None to my knowledge tonytegroce.
If there were one it would be at the back of the Power Supply in a fuse holder, or inside the Power Supply's case.
Power supply should be rated at a maximum wattage of 200 Watts, and is probably made by Bestec, HiPro, or Delta.
(Actual maximum wattage is more like 60 to 70 percent of what is stated. 120 Watts to 140 Watts)
{ NOTE*
I Do Not recommend opening the Power Supply. Inside the Power Supply are Electrolytic Capacitors.
Electrolytic Capacitors are designed to slowly build up a charge, then release it all at once.
Rough comparison is a large swimming pool filled up by a garden hose, then one wall is taken down all at once.
Electrolytic Capacitors can hold a charge for Weeks, Months, sometimes over a year, when power to them has been removed. (In this case; Power Supply unplugged from power)
IF, your fingers touch the two terminals on the bottom of a capacitor, the charge can be released to YOU.
IF, your fingers complete a circuit, that one or more capacitors are in, the charge can be released to YOU }
If the computer does not come on when you push the Power On button:
1) Check to see if the surge protector has power. Is the Power On LED light lit?
Next check to see if THAT receptacle in the surge protector, has power. The receptacle in the surge protector that the computer is plugged into.
You can use a table lamp, for one, to test.
I have had 4 surge protectors now, that just THE receptacle the computer was plugged into, had NO power.
Everything else had power. Monitors, router, sound system, printer, etc.
Sure that the computer is receiving power?
2) Perform the test to see if the Power On switch is bad, or the Power Supply.
{The Power On switch is an ATX power on switch. It is located inside the plastic Power On button assembly.
Example of an ATX Power On switch,
http://www.directron.com/atxswitch.html }
The test is to bypass the Power On switch. It does not involve the Power On switch, or the pins on the motherboard that it connects to.
A jumper wire is used on the 20-pin ATX main power cable connector.
This is an example of a 20-pin ATX main power cable, and it's respective connector on the motherboard,
http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20This is an illustration, and photo of the FIC AM35 motherboard, used in the HP Pavilion 523n Desktop PC,
http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph07899&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=90387
Scroll the page down. Illustration is first, photo second.
Motherboard sitting as it is in your computer; Processor to the top, and Ram Memory slots to the right, the 20-pin ATX main power cable connector on the motherboard, is to the Right of the ram memory slots.
In the illustration it is labeled - ATX Power Connector
In the photo it is to the right of the long Black ram memory slots, and is a whitish/yellow connector with two columns of 10 squarish socket holes.
Referring back to the example of the 20-pin ATX main power connector;
http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20Observe the photo all the way to the right. The ATX main power cable is plugged into the motherboard. This is the way it should be for the test.
A jumper wire is used to temporarily connect the Green wire, to ANY Black wire.
The Green wire you see is a Soft Power On wire. Abbreviated as PS_ON.
ALL of the Black wires you see are Ground wires.
The preferred jumper wire is a paper clip. It's small size, and stiffness is ideal for this application.
The paper clip is straightened out, then bent into a U-shape.
The middle of the U-shape is wrapped a few times with black plastic electrical tape.
This area is for your fingers to hold onto.
The 'legs' of the U-shape is inserted down into the socket holes of the 20-pin ATX main power cable connector.
The paper clip's 'legs' are inserted down into the socket holes, in the Back of the ATX main power cable connector.
The Back is where the wires go in.
The legs MUST be inserted down into the socket hole pretty far.
At the bottom of every wire going into the connector, is a metal terminal. (Female)
The legs of the paper clip MUST touch those metal terminals.
The legs go down in the socket hole, RIGHT NEXT TO the existing wire in the socket hole.
One leg goes down in a socket hole with the GREEN wire, the other leg goes down in ANY socket hole with a Black wire.
The contact period made is No longer than 2 seconds.
(The Power On switch is a Momentary Contact Switch)
IF the computer (Power Supply) comes on, the Power On switch is bad.
IF the computer (Power Supply) Does Not come on, the problem is a bad Power Supply.
Shock Warning:
The Soft Power On circuit uses 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.
There may, or may not be a spark when you touch the jumper wire.
If it makes you feel more comfortable, you may wish to wear a glove on the hand that uses the jumper wire. (Paper clip)
{Note*
One single wrap of black plastic electrical tape will insulate you from 600 Volts DC }
Post back in a Comment as to your findings after the test.
Regards,
joecoolvette
{Added note*
The harmful voltages are inside the Power Supply's case.
The Power Supply converts AC voltage into DC voltage.
(USA - 120 Volts AC
Europe - 220 Volts AC
Australia - 220 Volts AC
Japan - 100 Volts AC)
The DC voltages that the computer uses is.
A) 3.3 Volts DC
B) 5 Volts DC
C) 12 Volts DC
Inside the computer are very low DC voltages }
