chellebell Posted June 7, 2007 Share Posted June 7, 2007 Hi Can anyone help me please?I have a emachines 420 that has died on me! It was working fine and then suddenly the screen went blank and the light around the power button stayed on. The pc had to be turned off at the mains and never came back on! I did notice that the fans werent runnning as i couldnt hear them. I have had a look at the power supply - bestec atx-250-12e 250w power supply and there was no 5 or 12v coming out it and the fan wasnt running. So i ordered another one. When that one came i connected the mains to it and the fan in that one doesnt run either again no output even if i hold the power button on. Is there someway i can test if the psu is faulty or if something else is causing it not to work. I have tried it powered and disconnected from the computer but dont know if it needs to be turned on some how? I dont know if something could be wrong with something else which is causing the psu to appear faulty?Thank you Michelle Link to comment Share on other sites More sharing options...
Walchinc Posted June 7, 2007 Share Posted June 7, 2007 Check the monitor with another computer. If this works great . Then we know it could be the VGA card chip on the motherboard that has died on you. Not giving any output to the screen. Link to comment Share on other sites More sharing options...
Silvereyes Posted June 7, 2007 Share Posted June 7, 2007 The symptoms described suggest a problem with themotherboard power circuits rather than a psu issue.ATX style psu's have a 'soft' power switch facility whichprevents any output in the absence of the appropriatesignal on the interface.This means they simply won't work 'out of circuit' or inthe case of a motherboard problem which prevents thissignal being present.It is possible to overcome this by shorting the correctpin to gnd but switch mode psu's need a certain minimumload in order to function correctly and may actuallybe dangerous if operated 'out of circuit'.@WalchincPlease be careful when giving advice on subjects in whichyou have limited experience. Particularly those which haveserious safety considerations such as power supplies. Link to comment Share on other sites More sharing options...
chellebell Posted June 7, 2007 Author Share Posted June 7, 2007 Hi, thanks. The monitor is working fine. How would i know if it is the motherboard that is causing the problem? and if it is, is it expensive to fix? Link to comment Share on other sites More sharing options...
rendrag Posted June 7, 2007 Share Posted June 7, 2007 (edited) Motherboards in general are not user-serviceable, and in of themselves are not that expensive, especially the ones eMachines use. You might have to call them and see what brand and model they used in your PC. if it's available in the retail channel, you should be able to replace it without too much hassle.good luck Edited June 7, 2007 by rendrag Link to comment Share on other sites More sharing options...
chellebell Posted June 7, 2007 Author Share Posted June 7, 2007 Thanks for your help, i will see what i can find out about the motherboard. Is that likely to be the most probable cause? Link to comment Share on other sites More sharing options...
IcemanND Posted June 7, 2007 Share Posted June 7, 2007 may be the root cause but may have taken other components with it when it died. Link to comment Share on other sites More sharing options...
puntoMX Posted June 8, 2007 Share Posted June 8, 2007 (edited) For 80% sure it´s the mobo;You can replace the mobo eith a standard S478 one, but this time I would buy one with a IGP/AGP in you can´t find one with PCI-E.I would go with a ASRock P4VM890 or so, it even has a PCI-E sloth and isn´t that expensive...If you need some help, ask us . Edited June 8, 2007 by puntoMX Link to comment Share on other sites More sharing options...
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