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admin answers:

The pavilion a1520n has a 300w power supply (similiar to this http://www.atxpowersupplies.com/300-watt-power-supply-bestec-atx-300-12zcdr.php ) that has a +12v capacity of 19A/228W

According to my fave PSU calc http://www.extreme.outervision.com/psucalculatorlite.jsp your a1520n specs:

x2 3800 / 2 x ddr / 1 x sata / 1 x dvdrw / 1 x front panel mem reader / 1 x 9500gt ~= 227W (I used 9600gt for 9500gt overclocked)

So I think your OEM 300w unit should work just fine since the +12v capacity is sufficient. From my experience, the HP/Compaq OEM power supplies are not all so bad they tend to live up to specs.

However, if you want a warm fuzzy feeling, and have the $ to spare, no harm in upgrading. I would pick a unit that has a rear 80mm exhaust sometimes those are best for these type of OEM systems since the chassis itself may interfere with a 120mm power supply unit.

SeaSonic SS-300ES 300W http://www.newegg.com/Product/Product.aspx?Item=N82E16817151055
$38 (+12v@288w/24A http://c1.neweggimages.com/NeweggImage/productimage/17-151-055-04.jpg )

SeaSonic SS-350ES 350W http://www.newegg.com/Product/Product.aspx?Item=N82E16817151038
$47 (+12v@324w/27A http://c1.neweggimages.com/NeweggImage/productimage/17-151-038-07.jpg )

SeaSonic SS-400ES 400W http://www.newegg.com/Product/Product.aspx?Item=N82E16817151039
$54 (+12v@360w/30A http://c1.neweggimages.com/NeweggImage/productimage/17-151-039-10.jpg )

SeaSonic SS-500ES 500W http://www.newegg.com/Product/Product.aspx?Item=N82E16817151040
$65 (+12v@408w/34A http://c1.neweggimages.com/NeweggImage/productimage/17-151-040-07.jpg )

So plug in whatever other upgrades you wish to get in the near future, and get one of the above based on your PSU calc total wattage. So you can re-use it in a future pc, and don’t discard the OEM hp unit it is still capable, just put it back in. One advantage of these Seasonics, they are rated for 80+ efficiency so if you run it 24×7 it’s more ‚green‘ than the HP unit, less energy wasted in heat conversion, another reason for a warm fuzzy feeling? 🙂

The reason I tend to ignore the total wattage, modern ATX v2.x units need to supply the CPU and GPU power with the +12v rails. So focus on this over the total wattage.

Cheers

*EDIT*

„I need 26a on the 12v“

That is the manufacturer recommended +12v rail combined power, it is largely higher than needed since they need to CYA how do they know what other components you have in your system? They don’t and assume a really high value. You have to consider your system as a whole. But the SS-350 unit I mentioned has +12v@27A so that will work according to them 🙂

admin answers:

It looks like it would work. Despite it’s only a 200W psu (vs. 250W of the died supply) this is enough if you haven’t changed the original PC configuration (ram and hard drive don’t count).

Prior you pull out the defective one, note every cable you remove (most likely you have the main power connector 20/24pin, a 4pin 12V connector on the mainboard, the little 4pin connector for the floppy drive and two 4pin molex connectors for the hard drive and the CD drive).

The main power connector of the replacement psu has only a 20pin connector but this doesn’t matter even if you have a 24pin connector on the mainboard. This connector is coded so you can’t put it in the wrong way.

Good luck

admin answers:

This is a list of the parts used in a HP PAVILION P6142P,

http://partsurfer.hp.com/Search.aspx?type=PROD&SearchText=NP218AA

The power supply is a „300-watt (Merlot C) regulated,“ which is usually a Bestec ATX-300-12Z.

The PAVILION P6142P uses a standard width micro ATX minitower case (rather than „slimline“ case), so any standard ATX power supply should fit.

Http://bizsupport1.austin.hp.com/bc/docs/support/SupportDocument/c01746796/c02157795.jpg

Because the space inside a stock mini tower is usually limited, I would recommend not selecting a video card that’s longer than the width of the stock motherboard (9.6″ x 9.6″), at least, not until you open the case and measure. (For example, Asus makes a couple GTX 460 cards that are nearly 10″.)

This is the motherboard used in a PAVILION P6142P, HP/Compaq name Violet-GL8E AKA Pegatron M2N78-LA,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01635734&cc=us&lc=en&dlc=en

The fastest CPU the motherboard supports is a Phenom 9850 Agena, which isn’t much faster than the Phenom 9650 Agena you already have (2.5 GHz versus 2.3 GHz). So, there’s not much of a CPU upgrade available, unless you decide to swap in a newer motherboard/CPU/RAM.

The recommended power supply for a GeForce GTX 460 is 450 watts or larger, with at least 24A combined available on the +12V rails, with two 6-pin PCI-E power connectors.

Http://www.nvidia.com/object/product-geforce-gtx-460-us.html
http://www.evga.com/products/moreInfo.asp?pn=01G-P3-1372-TR

Any good quality power supply 500 watts or larger should be more than adequate.

These parts look okay. The MSI card is the standard length for a GTX 460 (8.25″ long), and the Antec power supply looks pretty good for $60 (made by Delta, 34A on the +12V).

Antec Earthwatts EA500, $60,

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371007

MSI N460GTX-M2D1GD5/OC, $180,

http://www.newegg.com/Product/Product.aspx?Item=N82E16814127551

admin answers:

HP Compaq Presario SR1900NX

It uses a Bestec 300W (that’s 300 watts) ATX power supply with a 19A 12V rail.

HP-Compaq p/n 5188-2625 replace with ATX12V-HP300BT.
Application notes:
(1) Bestec ATX-300-12Z CDR Compaq OEM part.
(2) Compaq Presario models SR2038X, SR1900NX SR1700Z CTO, SR1703LS, SR1717LS, SR1720LS, SR1730T CTO, SR1730Z CTO, SR1800NX, SR1817CL, SR1820NX, SR1830NX, SR1834NX, SR1838NX, SR1850NX, SR1900Z CTO, SR1901LS, SR1903LS, SR1911X, SR1913WM, SR1917CL, SR1917LS, SR1918LS, SR1920LA, SR1920LS, SR1920NX, SR1922X, SR1923WM, SR1924NX, SR1930KR, SR1930NX, SR1930T CTO, SR1930Z CTO, SR1931KR, SR1934NX, SR1936X, SR1950NX, SR1954NX, SR2000Z CTO, SR2001LS, SR2001NX, SR2003LS, SR2005LS, SR2006NX, SR2011WM, SR2015LS, SR2017LS, SR2018LS, SR2020LS, SR2030T CTO, SR2030Z CTO, SR2044NX, SR2050NX, SR1803WM.
Http://www.power-on.com/compaq.html
Here’s the power supply.
Http://www.atxpowersupplies.com/300-watt-power-supply-bestec-atx-300-12zcdr.php
If you needed this info for a graphics card, the best cards you can safely use with this power supply would be cards that draw 50W or less. You have a pci-express x16 slot, so a geforce 9500GT (50W) or a radeon HD 4650 (48W) are your best options unless you upgrade the power supply. Of these two cards the 4650 is better.
Http://www.gpureview.com/show_cards.php?card1=574&card2=580
If you decide to upgrade your power supply, the ATX form factor is very common so finding an upgrade will be easy.

admin answers:

*** Update ***

Ok, if you have the regular Inspiron 531 tower (not the 531s, which is a skinny slimline) then you can install a standard 400-450 watt ATX power supply. Although you shouldn’t need to- Dell’s regular towers come standard with 300 watt power supplies. Open the case and read the label on your psu. Sometimes the specs listed online confuse the slimline and regular tower models- I’ve never seen a regular tower with a 160W psu.

You don’t need an expensive graphics card, something like a Radeon HD 6450 or GeForce GT 520 is plenty for everyday work and watching videos- much better than integrated video.

Http://www.newegg.com/Product/Product.aspx?Item=N82E16814125378
http://www.newegg.com/Product/Product.aspx?Item=N82E16814134133

If you have the slimline Inspiron 531s, those same cards would work but you’d need a power supply upgrade first. Here’s a power supply for the 531s:
http://www.atxpowersupplies.com/250-Watt-Power-Supply-Bestec-TFX0250D5W.php

Since it’s only 250 watts, you might choose an even lower power consumption card like the Radeon HD 5450 (although the HD 6450 and GT 520 are confirmed to work fine)
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125314

You only need a 450W power supply if you’re looking to install cards like a Radeon HD 5750, GeForce GTS 450 or higher. Even the Radeon HD 5670 and GeForce GT 440 work fine on Dell’s stock 300W psu.

****
I agree- with a 160W power supply it sounds like you have a slimline or small form factor computer- those often cannot be upgraded very far because the power supplies are proprietary rather than standard ATX.

However the posters saying you need a huge power supply are completely wrong. When you see a graphics card requirement which states a 450W power supply, it doesn’t mean the card takes 450W all by itself! It means your WHOLE SYSTEM needs a 450W power supply to safely run with that card installed. It’s true that power supplies are only stable up to 80% of their advertised wattage, but that’s taken into account already.

Also, some cards (especially low-cost ATI/AMD cards) publish wattage requirements which are much higher than the cards actually need. For example, the Radeon HD 5570, 6570, 5670 and 6670 run fine on 300W power supplies, they don’t really need 400W. The Radeon HD 6450, 5450 and GeForce GT 520 all run fine on 250 watt power supplies.

Anyway… With any slimline your psu upgrade options will be VERY limited (and usually more expensive, too). Post the exact model number of your computer and we might be able to suggest specific replacements that will fit.