Power Supply Issues

I am having a problem where when I turn on the computer all the fans start going really hard, the light at the front of the case turns on, but the monitor won't get any signal, it doesn't look like it's loading anything and the DVD drive won't open either. Also there is a ticking coming from the PSU. I tried unplugging the ATX 4-pin cord and booting again, which made the fans slow down and the DVD drive would open, but still no signal in the monitor. I also tried my old PSU and everything worked fine.

Any help or suggestions would be greatly appreciated.

 

I think you've answered your own question.... if everything is fine with the old PSU, put it in! Or buy a new one. If the malfunctioning PSU is under a year old, it should be under warranty.

BTW- it's not a good idea to disconnect the 4 pin PSU connection, even for a minute for diagnostic purposes. You risk damaging the motherboard. I'm quite surprised that the PC powered up with the 4 pin unplugged, they usually don't.

 

I would stick with the old PSU, but then I'm running a 7900gt on a 300W with only 19A on the 12V rail with no PCI-E connector... I bought the PSU about a week ago and accidentally switched the input voltage over which blew the unit and it wouldn't even turn on. I took it to get repaired and now it atleast turns on. Also I noticed by unplugging certain cables that the fans run at normal speed etc. when I disconnect all the cables that run on the second 12V rail, but still no signal for the monitor, and the blue light around the power button sometimes turns off. I'm thinking of taking it back to the guy who fixed it tomorrow since it half worked this time, but is it very likely to be repairable? It's a coolermaster which are well made so I'm hoping it might work.

 

Probably, as long as you don't have to pay for it. It will probably cost more for a repair than a new PSU. Unfortunately, if you bought it new, and someone has since opened it up to work on it, the warranty has been voided and a free replacement is out of the question... switching the input over shouldn't have blown the unit, unless maybe you live in Europe and require 220v and it was set for 110 or 115....

 

Ok thanks, well the warranty doesn't cover it if you change the input voltage, so that wasn't an option anyway. I live in New Zealand so yeah it's normally at 230V. I think I'll just see how much it's likely to cost to repair and then decide. Thanks for your input.

 

Many psu units have internal fuses, inside the casing.