Question about Sunbeamtech SUNNU550-US-SV Nuuo 550 Watt Power Supply (Silver) Retail (SUNNU550USSV) Power Supply

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NO VIDEO SIGNAL

Hello,
I have an ASUS P5N-E SLI motherboard. Installed are two sticks (1Gig each) of DDR2 RAM, a EVGA GeForce 7950 GT PCIE video card, Intel Quad core processor, etc. When I power on the computer, the mobo light goes on, the PSU powers on, and so does the case fan and the the video card's fan. What fails to go on is the CPU's heatsink fan. Also I get no video signal on my LCD. I tried using a brand new video card to see if the video card is the problem, but I get the same error with the new video card. So the video card is ruled out.
I also tried using a different LCD monitor and I get the same error.
Has you experienced this problem before?
If the problem pointed directly to the heatsink fan, then I should at least get a few seconds of video on my LCD. I get nothing but, "NO VIDEO SIGNAL"
I do see that the fan on the PSU is spinning lightly, not with much enthusiasm.

Thanks

Posted by on

  • dtaveras79
    dtaveras79 Jan 04, 2009

    The microresisters and the capacitors look good. No signs of bulging or browning.

    I will try and test the PSU since I was adviced to do so by a user in a different forum.

    Thank you for you quick response.

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  • 40 Answers

You'll need to check the PSU first, you might want to buy a PSU Tester for 24pin PSUs.

Then you might want to do a in depth examination of your motherbard circuit components by doing the following...

Look for burned/broken microresistors. You might need a magnifying glass and good lighting. Any resistor showing a little blob or browning is burned. Microresistors are those minuscule black,gray,brown or white rectangles lying all over the motherboard's traces. Check first the ones near the power supply connector and near the chips, specially one that says winbond on it, this last ones may get burned from USB overloading, from using non-self powered hubs also called passive hubs.

You may check for blown capacitors, capacitors are those standing cylinders with a plastic cover around them with numbers and letters printed in those covers. On top they are left without a cover and they are aluminum color, they may be flat or have one or more grooves runing across the top. A blown capacitor, looks different from the others because it looks a little bloated on the top, or may have spilled some sort of transparent varnish from its bottom to the motherboard or its top to other components around.

Finally you may suspect of the CPU, athlons get very warm and they can get burned too. Never start your pc without a cpu.

Posted on Jan 03, 2009

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