pradeepsekar Posted July 22, 2007 Share Posted July 22, 2007 My 620W Corsair power supply unit is missing the white lead for -5V (Pin 20 in http://pinouts.ru/Power/atx_v2_pinout.shtml). Is this normal, or do I need to return my power supply? Currently, my mother board is not powering on. The Motherboard power LED comes on. Upon pressing the power button, the CPU fan turn very briefly, and then stops immediately. I noticed this when I was troubleshooting this problem. I have disconnected everything except the Video Card. The problem continues to persist. My bare bones config is: ASUS P5W Deluxe Wifi Motherboard, Core 2 Duo Q6600, OCZ DDR2 800 RAM (1MB x4). Is there any suggestion that you may have on how I should troubleshoot this? Link to comment Share on other sites More sharing options...
Garvin Posted July 22, 2007 Share Posted July 22, 2007 That's normal. The -5volt rail has been steadily phased out because it hasn't been used to power anything in a long time. It used to power early generation progammable read only memory chips on old boards and ISA bus cards (think AT systems and early generation ATX). As to the system failing to boot, here's a couple of links thay might help: http://www.xtremesystems.org/forums/showthread.php?t=112648 http://www.madshrimps.be/?action=getarticle&articID=508 Good luck. Link to comment Share on other sites More sharing options...
Need More RWHP Posted August 9, 2007 Share Posted August 9, 2007 My 620W Corsair power supply unit is missing the white lead for -5V (Pin 20 in http://pinouts.ru/Power/atx_v2_pinout.shtml). Is this normal, or do I need to return my power supply? Currently, my mother board is not powering on. The Motherboard power LED comes on. Upon pressing the power button, the CPU fan turn very briefly, and then stops immediately. I noticed this when I was troubleshooting this problem. I have disconnected everything except the Video Card. The problem continues to persist. My bare bones config is: ASUS P5W Deluxe Wifi Motherboard, Core 2 Duo Q6600, ******** DDR2 800 RAM (1MB x4). Is there any suggestion that you may have on how I should troubleshoot this? I have the same problem with my older PC after putting in a new PSU. While the -5v is not used these days, some board seems to refuse power-on if it detects -5v is missing. Try an old junk PSU with -5v just to see it would power up. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted August 9, 2007 Corsair Employees Share Posted August 9, 2007 The MB you use with this PSU would need to support ATX 2.1 or ATX 2.3 Spec. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.