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PC does not turn on,motherboard stanby_led on when power cord is plugged.

By irflo106 ·
My desktop computer just went black when I am using it. My desktop has an Intel DG33SXG2 MotherBoard. I tried to turn it on but to no avail.
The following is what I have done and observed:
(1) When I plugged the power cord to my computer, the motherboard standby led green turns on even though i did not turn on the desktop computer power switch.
(2) When I turn on the desktop computer power switch, the CPU fan will just rotate once and then stops also the motherboard standby led remains on. The power switch LED in front of my computer does not turn on. In other word, the computer does not turn on
(3) I plug and unpluged the video card and reseated the memory card everything but the same problem.
(with precaution about static, i grounded myself to the metal case of the desktop - ground terminal)
(4) Tried to remove one memory (Channel B-DIMM0)module, the video card, and other drives. I just left one memory card and the motherboard with the CPU (with CPU Fan) and the chipsets (North Bridge and South Bridge). The same problem occurs with standby_led on. I even put a new memory(from my other computer) but the same problem.
(5) Verified the PSU to be good by shorting the green and black wire of the 20-pin PSU plug. Still, Tried to use another PSU with higher power rating but still the same problem..
What seems to be the problem? I tried to look for Intel DG33SXG2 MotherBoard manual to help me about this problem.
Any help would be much appreciated.

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It's most likely a mainboard issue

by NickNielsen In reply to PC does not turn on,mothe ...

Check the capacitors (those things that look like cans) on the mainboard. The tops should be concave, so if you shine a flashlight onto one, it concentrates the reflection. If any are swollen, or leaking, that is the most likely problem. If many are swollen or leaking, you are probably better off buying a new board.

<a href=http://www.badcaps.net/pages.php?vid=5>This page</a> provides guidance.

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capacitors are not swelling and looks good(physically).

by irflo106 In reply to It's most likely a mainbo ...

Physically, the capacitors looks good (no swelling or leaking). But I will try to desolder them and check with my tester. Before buying a new motherboard I just want to be sure whether it is the motherboard or the CPU that cause this problem.

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It's still more liikely to be the mainboard than the CPU

by NickNielsen In reply to capacitors are not swelli ...

And even though it tested good, the power supply is more likely to be defective than the CPU.

In over 30 years of supporting, repairing, and maintaining PCs, I've had to replace 2 CPUs. I've lost track of the number of power supplies and mainboards I've replaced.

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try to purchase a motherboard

by irflo106 In reply to It's still more liikely t ...

thanks for the adviced. I am looking right now for the replacement of the motherboard Intel DG33SXG2 MotherBoard. It looks like I will end up buying the motherboard of which that this is my first culprit. Since you are in business for 30 years, then my doubt about the CPU is gone. Once again, thanks for giving me an adviced. I will send you a message once I replaced the motherboard.

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