ocyang Posted March 17, 2008 Posted March 17, 2008 I bought NF4 Ultra-D two years ago with Antec Smart Power 500W. After 6 month It can not boot up. (only one yellow LED on, no bios, no fan). Then I tried replace MB, it still failed. After replace PSU with same model, it start work fine for 3 month. Then same thing happened, so I replace with same model PSU again. Then after one year, same thing happened again.:sad: But this time I replace with different PSU(650W), but it only worked for 3 week then it stop working. When I was trying take out PSU, I forgot unplug power cord, so when I unplug the main 24pin cable, system back online. So at first I think it may the connector problem, but it is not after very careful check. The PSU I am able to jump start with short green and black pins. If I do that, the system is working fine after power up. (I also tested broken Antec PSU, it also working fine with jump start) So do you think the problem is the picky MB? Maybe because after while, the PSU output voltage changed and out of range. (from bios they are looks perfect fine, about 1% over) Anyway to disable MB to shut off power supply from BIOS? Or only way is to replace MB? Thanks! Share this post Link to post Share on other sites More sharing options...
Sharp Posted March 17, 2008 Posted March 17, 2008 Hello, If you hold down the board's power button it should turn off. What else are you using with this PC? Was the 650W an Antec PSU? Share this post Link to post Share on other sites More sharing options...
radodrill Posted March 17, 2008 Posted March 17, 2008 I'd say it's probably issues with the power supplies; I've seen so many problems occurring due to cheap and/or underpowered PSUs The DFI NF4 boards are very power hungry and often picky about hardware (PSUs in particular). Share this post Link to post Share on other sites More sharing options...
ocyang Posted March 17, 2008 Posted March 17, 2008 But why it always can work for few month and then stop working? (The PSU still work fine by it self if I short black and green pins) It must be the MB shut off the PSU when detect something out of range. Share this post Link to post Share on other sites More sharing options...
kitfit1 Posted March 17, 2008 Posted March 17, 2008 @ ocyang, why don't you make a proper sig listing ALL your hardware. That way the problem will be solved much much faster. Share this post Link to post Share on other sites More sharing options...
radodrill Posted March 17, 2008 Posted March 17, 2008 The PSU still work fine by it self if I short black and green pins Just because a PSU can be jump-started doesn't mean that it'll work properly under full load. I've seen countless problems here in the forums that showed similar symptoms and the problem turned out to be a dead or underpowered PSU. Share this post Link to post Share on other sites More sharing options...
ocyang Posted March 18, 2008 Posted March 18, 2008 Today I tried with CoolerMaster Real Power 750W, it even can not start at beginning. So I go back with Antec 500W. After jump start, I check the 12V voltage at BIOS, it show 12.48V, which is 4% over 12V. So I believe with cool start, it may around 5% and MB will try shut PS off for protection. I don't thing it is under power problem since I only use one GT6800 and after power on, every things is running fine for years. I will try replace MB. Do you think ASUS is also picky with power supply? Share this post Link to post Share on other sites More sharing options...
old_geekster Posted March 20, 2008 Posted March 20, 2008 OC, as has been said several times, if we knew what components are in your rig, we could help you more. Please make a list of your components like you see at the bottom of everyone's posts. Share this post Link to post Share on other sites More sharing options...
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