New power supply blew on me

By ruedogger
Nov 4, 2007
  1. Just got a new PSU. upgraded from a 300w toa 500w and while it ran for about30 minutes, it then blew. no led no nothing. Plugged in the old power supply and it proceeded to boot and restart a few times without getting to the main screen. It got here after about 4 tries and seems to be running stable for the time being. Any ideas on why this happened? To help with information here are the 2 power supplies

    the one that I had, and currently have in is an Allied AL-C300 ATX and it's specs are as follows


    AC Input 115/230V~------8a/4a---------60/50Hz

    Max DC +3.3V-----+5V-----+12V--- -12V------+5VSB----BLK---GRN---GRY
    Output 27A------26A-----18A-----0.8A-----2A----COM----PS-ON----P.G.

    Any IDeas?

    Thx in advance.

    edit: wanted to add that I've been researching this all morning, and while this link is just a generality all the wire colors matched on the 24 pin main power cord on the power supply...all except one which is missing. If you go to this link and look at the 24 pin plug, the right side 5th from the bottom is a 5v white wire which is not in the main plug I have on this new power supply. Is this the problem. I'm not sure what is powered by the 5v. After installing the new power supply, all my fans, my cdrom and my dvd drive were functioning, my floppy was being read as well as my HD obviously, and the CPU unit. Device manager showed everything to be functioning correctly immediatly after installation. This may be the problem but want to be sure before I go take it back and get a new one. Ideas?
  2. Nodsu

    Nodsu TS Rookie Posts: 5,837   +6

    The -5V wire was removed from the ATX specification. It is perfectly normal to have a PSU without it.

    Just RMA your dead PSU - it was probably faulty..
  3. Tedster

    Tedster Techspot old timer..... Posts: 6,000   +15

    If you spent $40 or less on your PSU it was probably el cheapo crap.
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