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Mobo doesn't power up...Needs white wire in 24pin connector?

post #1 of 7
Thread Starter 
I just got an (new) old-model biostar mobo A780L3G which I think is about 2-3 yrs ago due to the Hd3000 gfx. I also ordered a new psu to power it but the mobo wouldn't power up when I used the new corsair psu. Then I replaced it with my old 220w and it powers up just fine... Then I compared those two psu's and found that the 220watt has the white wire in the 20+4pin connector while the new corsair 500watt doesn't have it. Maybe my mobo is the old model and it needs that white wire to work. Do I need to order another mobo? I googled and saw some people said the white wire is -5v or something like that..

Can someone please help me because I don't want to use the old 220watt psu for my oc'ing.... Thank you very much
    
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post #2 of 7
-5V was removed from the ATX12V specification in 2003. If a PSU has that wire then it's obsolete and should not be used with any system made since then.
post #3 of 7
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
-5V was removed from the ATX12V specification in 2003. If a PSU has that wire then it's obsolete and should not be used with any system made since then.
I see...but my new corsair 500watt builder series is not compatible with my mobo. Is there anyway to power it up without the white wire? I mean my old 220w powers my new mobo just fine... should I just get another mobo and sell this one? Thanks
    
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post #4 of 7
My guess is that the CX500 is faulty. Try an RMA.
post #5 of 7
Thread Starter 
is it possible that it's faulty and it also can power my p4 system? because it's doing it right now just fine. Thank you for the answer.
    
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post #6 of 7
Yes it is possible. And that Biostar A780L3G does NOT use the -5v white wire at all so not having it on the psu has absolutely NOTHING to do with why it isn't powering up.
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442
(15 items)
 
Q6600
(14 items)
 
Piece O' Crappola
(13 items)
 
CPUMotherboardGraphicsRAM
Q9550 E0 DFI LanParty LT P35-T2R 2 x HD4670QT512P CF Patriot PVS24G8500ELKN 
CoolingOSMonitorPower
Stock pfsense Acer H233H Antec EarthWatts 430 
CaseAudio
custom onboard 
CPUMotherboardGraphicsRAM
Q6600 B3 Lapped @ 3.4 GA-EP45-UD3R EVGA 9600GSO 384m 96SP 4G (2x2) Patriot Viper PC2-8500 
Hard DriveOptical DriveCoolingOS
80g Maxtor, 320WDC. 320Seagate NEC ND-3550 & LiteOn CM Hyper 212+ w/PP Blademasters XP Pro SP3 
MonitorPowerCase
Acer H233H Rosewill RG630-S12 NZXT BetaEVO 
CPUMotherboardGraphicsRAM
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Hard DriveOptical DriveOSMonitor
80Gig WDC SATA NEC ND3540A Win 7 Ultimate 64bit/XP Pro Acer H233H 
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post #7 of 7
Thread Starter 
Thanks and +rep to both of you for helping me out ^_^
    
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