Question about Compaq 300Wt Presario ATX Power Supply Power Supply

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Flashing Green Light on Power Supply

I have a Compaq Presario SR 1318 NX with a ATX 300-12z Rev: BD HP P/N 5187-6114. While we had a power outage I had turned the computer off, when I tried to turn it back on I noticed a green blinking light on the back and the computer would not turn on. Does anyone have idea's as to what could be wrong with it? Do I need a new power supply?

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  • Anonymous Jan 19, 2009

    same 4 me

  • adr67 Jan 28, 2009

    Power outage due to an ice storm. Now the computer is dead, and only the green light blinks. Is the supply dead and needs replacing?

  • brleever Feb 09, 2009

    Same as them.

  • Anonymous Feb 11, 2009

    so... how to fix it?

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  • 254 Answers

Get yourself a themaltake ps

make sure you remove the old one and take it with you to the shop or get the shop to do it for you if you dont have the expertise yourself.


hope this helps

Posted on Jan 01, 2009

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Posted on Jan 02, 2017

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1 Answer

Does a solid green light mean the power supply is ok when disconnected from motherboard and drives, ATX-300-12Z


Not necessarily. The green light usually just signifies power to the power supply. Amazon sells a cheap power supply tester that can verify everything on a power supply from old to new.

Jul 21, 2014 | HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP...

1 Answer

Bestec power supply model ATX-300-12Z Rev BD green indicating light flashes on off when plugged in.


Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from Amazon.com, newegg.com.. Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

Jan 06, 2011 | HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP...

1 Answer

Green light in rear flashing won't part up


The green light flashing is a diagnostic LED light, telling you there is a power failure.
More specifically a bad Power Supply.
Weak voltage power rail.

The Power Supply used in a Compaq Presario SR1010Z desktop computer, is a 300 Watt unit, and is an ATX form factor.

[ATX form factor for a Power Supply, denotes the size of the Power Supply case, and the shape.
It is approximately 6 inches Long, 6 inches Wide, and 3-1/2 inches Tall.
The ATX form factor for a Power Supply is used in over 90 percent of the personal computers out there, and is as readily available as the air we breathe]

Usually, HP uses one of three generic Power Supply manufacturers.
1) Bestec
2) Delta
3) HiPro

All are low quality Power Supply manufacturers.

This is HP Support, and the main menu page for the Compaq Presario SR1010Z desktop computer,

http://h10025.www1.hp.com/ewfrf/wc/product?product=1146324&lc=en&cc=us&dlc=en&submit.y=7&submit.x=6&lang=en&cc=us

If you click on Manuals, then on Upgrading and Servicing Guide on the following page, there are instructions on how to open your computer case.

This is instructions on how to replace a Power Supply, from HP Support,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01356113&cc=us&lc=en&dlc=en&product=3548196

(It's for a Pavilion a6230n desktop computer, but after you open the computer case of your Compaq Presario SR1010Z, the instructions are the same)

What Power Supply would I recommend?
There are 100's to chose from.
This is but one example,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3276575&CatId=1078

Chosen because;

1) Maximum wattage is rated at 450 Watts.

A computer ONLY uses the power it needs, and NO more.
Wouldn't matter if you had a 10,000 Watt power supply, (No such thing. An exaggeration), if your computer only needs 100 Watts, it would only use 100 Watts.
(Surfing the internet typically uses 100 watts)

2) Has all the power cables you'll need, and more. Tie up the power cables you do not need. (Use plastic ties, Not wire, or bread wrapper ties)

3) 24 Amperes (24A) on the 12 volt power rail.

4) 135mm cooling fan.
The cooling fan on the Power Supply you have now is 80mm.

A larger fan turns slower. Produces as much air as a smaller fan, (Or more), but makes less noise.
Less wear on the fan's bearings also.

5) Is an ATX form factor Power Supply.

6) It's 80 percent efficient, compared to the 60 percent efficient Power Supply you have now.
(That is, if it was working)

Sep 12, 2010 | HP Compaq Presario sr1010z PC Desktop

1 Answer

I think my HP Pav powersupply is dead. When I plug it in and try to turn it on, nothing happens to the HD and computer except a green light flashes on the back of the power supply. It is a Bestec...


all atx powersupplies are generic-it dous not really matter what computer it comes from unless its a high end pc requiring loads of power-if your machine is intel you may need a supply with an extra twelve volt lead(two yellow and two black leads in a little block)-but for that pc i would just harvest a powerpack out of a dead machine

Feb 25, 2010 | Compaq Computers & Internet

1 Answer

Bad power supply?


Do yo have a volt meter or an atx psu tester?
you can check voltage to see

If a power supply is bad, your pc will turn off or/and turn on and turn off. As long as your system is running without and shut downs your good.

However if your pc is turing off, I would change it as soon as you can. basically what is happening, when you unplug everything there isn't much of a draw on power so the light remains steady, but when you plug devices in there is a draw and the PSU cannot deliver.

I hope this helps.

Sep 07, 2009 | HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP...

1 Answer

Green light flashing on the back of the cpu


Your power supply just died. If you don't have a surge protector, the power outage probably sent too much voltage to your computer. A power supply is relatively easy to install, but you do have to have some knowledge to do so.
Try looking at this: http://www.fonerbooks.com/r_power.htm
If you don't understand it, you should be able to get someone to replace it for you for relatively cheap. Also, you can get a new power supply for about $20 on E-bay.
Also, make sure your computer-- and all major appliances-- have a surge protector on them, because this kind of stuff happens ALL THE TIME.

Apr 04, 2009 | HP Remanufactured Compaq Presario SR1130NX...

1 Answer

Compaq dead after power company shutdown period


Sounds like a blown fuse in the psu, replace the unit and you should be good to go.

Nov 30, 2008 | HP ATX-250-12Z, ATX-250-12Z Rev. H1, HP...

1 Answer

System will not power up


Here is a Compaq document will walk you thorough a fairly lengthy procedure that should solve your problem. Here is the link: http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&lc=en&cc=us&dlc=en&product=431080&query=presario%20sr1220&dest_page=product#N561 Let us know how this turns out or if you need any additional assistance.

Jan 02, 2007 | HP Compaq Presario SR1220NX (PJ517AAR) PC...

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