My desktop PC with D845WN motherboard does not boot up. I checked power supply voltage, they are OK(12V & 5V). I replaced AGP video card, but still no boot up. I checked the button battery voltage it shows a little low(2.75V). Anydody have an idea where to check?

There are many things you need to consider before purchasing a new graphics card.
First you need to know what type of graphic card is compatible with your motherboard and how much space you have inside of the PC tower.

Since newer cards use a lot of power, it is also important to check your PCs power supply.
The simplest way to find out what type of graphic card is compatible to your motherboard is by looking at the expansion slot and power specifications in the motherboards manual.

Locate your motherboard's manual.
If you don't have one then open up your web browser and enter your motherboard or PC's manufacturer's website.


Go to the support page on the manufacturer's website and enter your motherboard's model number.


Download the motherboard's manual from the support page.
Look for the "expansion slot" section in the manual to check the motherboards expansion slot specifications.

If your motherboard uses a AGP expansion slot then write down the version (1.0, 2.0 and 3.0), and the bandwidth (1x, 2x, 4x or 8x).

If your motherboard uses a PCI Express expansion slot then write down the amount of lanes (x1, x4, x8 or x16).


Look for the "Power Supply" specifications in the manual and write down the power supply's voltage (3.3V,5V or 12V).
http://www.nvidia.com/object/hardware_support.html

or
Determining a compatible graphics card

Download, install and run SiSoftware's Sandra (see link Below)
http://download.cnet.com/SiSoftware-Sandra/3000-2086_4-10556571.html
Free to try $49.99 to buy

to find out information on your motherboard. Click the "Mainboard Information" icon, then write down the information next to "Manufacturer" and "Model."

Navigate to the motherboard manufacturer's website.
If you are not sure of the website's URL, enter the manufacturer's name into a search engine to find the company's website.


Go to the support page and enter your motherboard's model.
Download the motherboard's manual or review the specifications.


Search the manual or specifications for "Expansion slot," "AGP" or "PCI Express."
If the expansion slot uses AGP, note the version (AGP comes in 1.0, 2.0 and 3.0), as well as the bandwidth (1x, 2x, 4x or 8x).

If the expansion slot uses PCI Express, note the amount of lanes (x1, x4, x8 or x16).
Search the manual or specifications for "Power," "PSU" or "Power Supply."

Write down the power supply's voltage (3.3V, 5V or 12V) and amp rating (designated by "A").
Not all manufacturers list the amp rating in their documentation, so you may need to contact the manufacturer for more assistance.


Compare the graphics card you want to buy to the motherboard's expansion slot.
AGP cards won't work in motherboards using PCI Express, and vice versa.


Similarly, AGP 3.0 cards won't work in motherboards using AGP 1.0. A PCI Express x8 card will not fit in a PCI Express x1 slot.

Check the voltage and amperage of the video card to the voltage and amperage on your motherboard.


A video card that requires a higher amp rating requires a powerful PSU.


or you might download this free version
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=4&cad=rja&uact=8&ved=0CEAQFjAD&url=http%3A%2F%2Fwww.filehippo.com%2Fdownload_sandra_lite%2F&ei=-nofU4SfAca2kgXV-oHoAg&usg=AFQjCNEyYUGLL5zPj4HwypFgd_gBUq8Edw&bvm=bv.62788935,d.dGI
Sandra Lite 2014 SP1a (20.21)

Hope you mean upgraded ram to 8 GB 8 mb is not much ram to run a computer.

To upgrade your computer's graphics card, unfortunately you can't just simply purchase a card and install it to your computer. Before purchasing a card, you must first confirm what is compatible with your motherboard. Graphics cards use either AGP or PCI Express technology. Many older computers use AGP. AGP cards can vary in version and bandwidth, whereas PCI Express cards can vary based on their lane . Moreover, the card itself is not your only consideration when looking to upgrade your computer's graphics. You must also consider the strength of your computer's power supply as well, since most newer cards use a lot of power. Download, install and run SiSoftware's Sandra (see link Below) to find out information on your motherboard. http://download.cnet.com/SiSoftware-Sandra/3000-2086_4-10556571.html Click the "Mainboard Information" icon, then write down the information next to "Manufacturer" and "Model." Navigate to the motherboard manufacturer's website. If you are not sure of the website's URL, enter the manufacturer's name into a search engine to find the company's website. Go to the support page and enter your motherboard's model. Download the motherboard's manual or review the specifications. Search the manual or specifications for "Expansion slot," "AGP" or "PCI Express." If the expansion slot uses AGP, note the version (AGP comes in 1.0, 2.0 and 3.0), as well as the bandwidth (1x, 2x, 4x or 8x). If the expansion slot uses PCI Express, note the amount of lanes (x1, x4, x8 or x16). Search the manual or specifications for "Power," "PSU" or "Power Supply." Write down the power supply's voltage (3.3V, 5V or 12V) and amp rating (designated by "A"). Not all manufacturers list the amp rating in their documentation, so you may need to contact the manufacturer for more assistance. Compare the graphics card you want to buy to the motherboard's expansion slot. AGP cards won't work in motherboards using PCI Express, and vice versa. Similarly, AGP 3.0 cards won't work in motherboards using AGP 1.0. A PCI Express x8 card will not fit in a PCI Express x1 slot. Check the voltage and amperage of the video card to the voltage and amperage on your motherboard. A video card that requires a higher amp rating requires a powerful PSU. Hope this helps.

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Try a different keyboard. If that does not help, then you have a serious problem:
* power-supply not sending all the voltages (5V, 12V) that it should be sending;
* video-card loose in its socket;
* video-card malfunctioning;
* RAM loose in its socket(s);
* RAM that is malfunctioning;
* problem with the motherboard.

If you don't know how to trouble-shoot each of the above problems, it's time to take the computer to a qualified technician, for proper analysis & repair.

You may clean the memory board and video card connector with pencil easier and with alcohol the connectors and reinstall it. this will work. or you need to replace the power supply the orange wire 3.3v might be missing or red+5v, white-5v or the purple wire +5v

Your Intel D850MV motherboard uses an AGP video card. There is no onboard video (built into the motherboard). Before replacing the video card try swapping out your monitor with another. Check for display. When the system is powered on can you hear the internals running? If the swapped out monitor does not show display you'll have to replace the AGP video card. The Intel D850MV motherboard only supports AGP cards that run at 1.5volts only & can run at 2x or 4x speed. Intel shows the difference between compatible 1.5v AGP card connector & the 3.3v non compatible video card connector. Click on the Intel link to see this; http://www.intel.com/support/motherboards/desktop/sb/cs-009010.htm This next link shows a compatible AGP video card that will replace your old card; http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4116644&csid=ITD&body=MAIN#detailspecs Thanks for using fixya

5V Stand-By Indicator LED
The power supply will always supply a 5V standby voltage to your
motherboard so that it can power on via for example Wake On Lan
technology. This LED shows that your power supply is supplying
this standby voltage to your motherboard.n :D

You may need to replace your power supply, if the LED is flashing, it's not supplying the power the motherboard needs.

[JP-25]

1 2 3 4 5 6 7 8 9
. . . . . . . . .
. . . . . . . .
10 11 12 13 14 15 16 17 18


1] Power Led (+)
2] --
3] Power Led (-)
4] --
5] --
6] Speaker (+)
7] --
8] --
9] Speaker (-)
10] Reset switch
11] Reset switch
12] N/A
13] Power Switch
14] Power Switch
15] ACPI Led (+)
16] ACPI Led (-)
17] HDD Led (+)
18] HDD Led (-)


For future reference you can download your motherboard manual here:
(PDF) Soyo K7VKP2

Yes this is a good list of the voltages to be expected from a newer power supply on just the main header

um what you want lol:?

try this :

- replace your power supply with an AT power supply
- try to check the compatibility of your computer
-

Try to replace the power supply with another known working power supply from another P4 desktop and then reconnect your wires from the front panel led lights, changing them around until they are in the correct position. I had an almost similar problem and I did the above, it is working now. All the best ! sirjohn