HP Support > Pavilion a1630n Desktop PC > Main Support page,http://h10025.www1.hp.com/ewfrf/wc/product?product=3245027&lc=en&cc=us&dlc=en&lang=en&cc=us
Took you this way in case you need additional information, and software; in the future.
No, replacing the Power Supply is not listed.
In the list click on the blue - How To
Now on Adding/Replacing Hardware.
Opening the PC Case
BEFORE working inside your computer, follow Anti-Static Precautions.
Your body carries Static electricity. Static WILL fry out (Short Circuit), the delicate hardware components inside a computer.
Relieve your body of Static.
Computer ON a table, computer unplugged from power, computer case open;
TOUCH an unpainted surface of the metal frame, of the open computer case.
This action will relieve your body of Static.
IF you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return.
1) Remove ALL cables. If you are not EXACTLY aware of where each cable goes, suggest making a drawing, and notes; as to where each cable goes before removing them.
2) Suggest lay a static free towel on the table you're working on, and lay the computer on it's side; opening of computer case -> Up.
Towel/cloth helps prevent scratching the table, and the computer.
Much easier to work on the computer this way, IMHO.
3) The plastic front of your computer is the Front Panel.
The area of contact pins on the motherboard, that the main wires from the Front Panel go to, is the Front Panel header.
(Power On switch, Power On LED light, Harddrive activity LED Restart switch; IF used)
The Front Panel header pinout is NOT listed. I THINK I know where the wires go. The Front Panel header pins. I do NOT know the color of the wires, though.
When replacing a Power Supply wires get bumped, and may get accidentally disconnected.
Suggestion is you make a drawing, and notes for the Front Panel header, and color of wires; also.
Also for the headers going along the bottom of the motherboard.
Better to safe, than trying to figure it out later.
4) The Power Supply has a Form Factor. This term was used strictly for motherboards, but has gone also to the Power Supply, and Computer Case.
The Form Factor for your Power Supply is ATX.
The term refers to the size, and shape of the case; and the power cables.
Size is approximately 6 inches Wide, 5.5 inches Long, and 3.5 inches in Height.
(152.39mm Wide x 139.7mm Long x 88.89mm Height)
It is a generic unit made by Bestec, HiPro, or Delta.
Maximum rated Wattage is 300 Watts.
(ACTUAL wattage is more like 60 to 70 percent, of what is stated.
180 to 210 Watts!)
This is JUST a look at an example. Not advertising,http://www.amazon.com/dp/B001KNO1P6/ref=asc_df_B001KNO1P62343186?smid=AZCEI3EMXUPTH&tag=nextagusmp0359933-20&linkCode=asn&creative=395105&creativeASIN=B001KNO1P6
By the photo you can see the type of power cables, and number used.
If I were recommending a replacement Power Supply, I sure would not recommend the above example.
A) Low quality Electrolytic Capacitors
B) Low quality Rectifier Bridge
C) Low quality MOSFET's
D) Low quality wiring; too small in gauge sizehttp://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3255390&CatId=1077
The above example gives a true 350 watts. Has all the power cables you'll need, an extra ones.
Suggest you find a Power Supply comparable to this one, when replacing.
Here's a look at your motherboard,
(Product information > Product specifications > Motherboard Specifications - A8M2N-LA (Nodus M3)http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00757531&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=3245027
5) There are TWO power cables from the Power Supply, that plug into the motherboard;
A) 24-pin ATX Main power cable;
Looking at the motherboard photo, this power cable's connector, is all the way to the right/middle of the motherboard.
It is the whitish long connector that has two columns of 12 socket holes.
This is a general example of the power cable, and it's respective connector on the motherboard. NOTE* Color of connectors does NOT matter,http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24
Note the power cable connector's Lock on the side, shown in the middle photo, and photo to the right.
The Lock is hinged. Operates like a see-saw on a playground.
The Top, or part that is closest to the wires; is squeezed in with the fingers, and thumb.
This action brings the hooked end at the bottom, away from the Lock Tab, on the motherboard's female connector.
Now the power cable's CONNECTOR, can gently be wiggled, and pulled up on; with the Lock depressed.
(ONLY use the connector when disconnecting a cable. DO NOT pull on the wires)
The Power Supply I referenced as a recommendation, and all new Power Supply's; have a 20 + 4-pin ATX main power cable.
This type of power cable connector was brought out, so that the Power Supply could be used on motherboard's that required a 20-pin ATX main power cable; or a 24-pin ATX main power cable.
Either use the extra 4-pin power cable to make a 24-pin model; or don't, to have a 20-pin model. YOU will use the 20-pin AND the 4-pin power cable - together.
General example of said cable,http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4
NOTE the color code of the wires, in the additional 4-pin power cable.
Two Yellow (12 Volt), One Red (5 Volt), and One Black. (Ground)
B) The second power cable going to the motherboard, also has this type of Lock;
The 4-pin ATX +12 Volt Power cable,http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4
NOTE the color code of the wires.
Two Yellow (12 Volt), two Black. (Ground)
You cannot mix the two power cables up, because the connectors are different, but wanted you to be aware of their likeness.
[4-pin ATX +12 Volt power cable, and 4-pin power cable for 24-pin ATX Main power cable)
Looking at the Top/Left in the motherboard photo, the square whitish 4-socket hole connector; is for the 4-pin ATX +12 Volt power cable.
6) Looking at -
HP Pavilion Media Center a1630n Desktop PC Product Specifications; tells me there is a SATA harddrive used, and a SATA optical drive,http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00753784&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=3245027
Harddrive - 250GB SATA / 7200 rpm
16X DVD (+/-) R-RW RAM (+/-)R DL Lightscribe drive, is the optical drive.
Lightscribe was developed to be used on SATA optical drives. (CD/DVD drive)
Therefore I conclude it is a SATA optical drive.
The SATA harddrive, and the SATA optical drive; use this type of power cable,http://www.playtool.com/pages/psuconnectors/connectors.html#sata
Between it, and the SATA data cable, the SATA power cable's connector is longer. It has 15 contact pins.
A SATA data cable has 7-pins.
More in an added Comment.