1) Computer unplugged from power, open the computer case.
If the computer is dirty inside, as well as the Power Supply, suggestion is to use a can of compressed air for computers, and clean both the inside of the computer, AND the inside of the Power Supply.
[My method for cleaning a desktop computer with a can of compressed air for computers.
Attach the plastic straw to the can of air's nozzle. Start at the top inside left corner of the computer, spray air across to the top right inside corner, going across in a row.
When spraying use the method a painter would use.
Press the nozzle trigger of the can of air, in all the way as you start, let go of the trigger at the end of the row you just made.
Drop down a space, go across again making another row. (How far to drop down is up to you. I usually drop down about 1 inch)
Keep going across, and down in rows, until you have reached the bottom of the computer case.
Upon reaching the bottom, tilt the computer case towards you slightly, {Hold on tightly, don't drop the computer}, and spray the dust, etc, out. You may wish to use a dust mask when cleaning.
When you approach the Processor fan, use Short Bursts of air. You do not want to spin the Processor fan, faster than it was designed for.
This could harm the Processor fan bearings, leading to premature failure of the fan.
Go to the Power Supply case from the inside of the computer, spray air through the ventilation holes. Start at the top, and aim the straw to the sides, then the bottom.
When spraying HOLD on to the can of air, AND the plastic straw.
The straw can come loose, and go into the Power Supply!
Come around to the back of the computer, and use Q-tips to dislodge the heavy buildup of the fan blades, center hub of the fan, and the fan's surrounding cage. {Shroud}
You are just breaking the 'crust' of the heavy 'gunk'. Now use the can of air to remove it.
This will push the 'gunk' into the Power Supply, and inside of the computer, somewhat. Go back to the inside of the computer, and spray out the Power Supply, and inside of the computer at the bottom.
A VERY large percentage of computers are dirty inside. (Both desktop units, and laptops)
Dirt, dust, hair, carpet deodorizer, you name it, builds up inside a computer over time.
No matter how good a housekeeper you are.
This 'Gunk' lowers the cooling capacity, of the cooling components tremendously.
Heat = Wasted Energy
The Power Supply strains to keep up with the call for power.
Eventually components inside the Power Supply fail, and the Power Supply fails.
When the Processor fan, and the Heatsink under the fan, are clogged with gunk, this causes the Processor to overheat.
The Fail Safe feature of the Processor will turn the Processor off.
(BIOS turns it off)
Keeps the Processor from burning up.
(Burning up, Sometimes Literally!)
After so many times of doing this, the Fail Safe feature may not engage, and the Processor will burn up]
2) Follow Anti-Static precautions BEFORE you reach inside the computer.
[Anti-Static Precautions:
Your body carries Static electricity.
Static WILL fry out (Short Circuit) the delicate hardware components inside a computer.
Computer unplugged from power, computer on a table, computer case open, TOUCH the metal frame.
This will relieve your body of Static.
Should you get up, and walk away in the middle of working on your computer, upon your return TOUCH the metal frame again ]
3) Disconnect all power cables leading from the Power Supply, to the various hardware components inside the computer.
[Motherboard, {20-pin ATX main power cable}, Harddrive, Optical drive/s {CD/DVD drive/s}, and the 4-pin ATX +12 Volt power cable to the motherboard.
A) 20-pin ATX main power cable:
http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20
B) 4-pin ATX +12 Volt power cable:
http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4
( NOTE the lock on the side of both of these connectors. Press the top of the lock in, as you gently pull up on the connector. Pull up on the connector, and NOT the wires ]
Make notes, and a drawing if you wish, as to where each power cable goes before disconnecting.
Motherboard Specifications,
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00063244&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=425916
Scroll down for an illustration and photo of the bare motherboard, with no hardware components attached.
Shows you where the power cables > 24-pin ATX main power cable, (To the right of the ram memory slots. CONN1), and the 4-pin ATX +12 Volt power cable plug into the motherboard.
(To the bottom left corner of the Processor socket. JPW2)
Do Not disconnect the cables (Wires) leading from the Front Panel of the computer, to the motherboard.
(Front Panel. Where the Power On button is)
Close the computer case, plug the computer into power.
Press the Power On button.
If you still get a blinking light on the Power Supply, ("and green light at rear near ac cord"), you have a bad Power Supply.
Replace the Power Supply.
If you need guidance in doing so, please state in a Comment.
(Believe upper right of your page)
You can buy a cheap quality ATX power supply for now to get you by, ($20), and install a quality unit later, or buy an inexpensive quality unit now, and avoid the headache later. ($40)
[Opening the Compaq Presario SR1110NX computer case
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=425916&
In the list Left-click right on the file name -
Compaq Presario Desktop Products - Upgrading and Servicing Guide.
This is a PDF file. Takes a few seconds before you see the first page, (File is downloading in the background), and additional time for the file to fully download.
Suggest you let the file download all the way, before looking through it.
Page 6 deals with opening the computer case.
Check first all the cable, by unplugging it
Thanks!
RF Mercado
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