Just another help topic

chuck990

chuck990

chuck990

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7 Dec 2008
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UK
Hi i recently had to replace a psu as the computer turned itself of and wouldnt start... now it has arrived and i have not simply been able to "plug-and-play" as i had wanted! When i press the power button the machine starts for about 2 seconds and stops, then turns on again and stays on.. only thing is there is no display! does this mean i need another replacement part? ive tryed both pci slots for the graphics card, ive tryed both out-ports on the card and 2 different screens....
 
Start with the simplest things first, you have connected the PCI-E power connectors to the gfx card yeah?
If so then have you got a spare gfx card you could try?
 
o yer sorry

Microsoft Windows Vista Ultimate SP1
Intel Core 2 Duo E8500 LGA775 'Wolfdale' 3.16GHz (1333FSB)
Asus ATI Radeon HD 4850 1024MB GDDR3 TV-Out/Dual DVI/HDMI (PCI-Express)Asus P5Q Pro Intel P45 (Socket 775) PCI-Express DDR2 Motherboard
OCZ ModXStream Pro 600w Silent SLI Ready ATX2 Modular Power Supply
NZXT Guardian 921 Crafted Series Tower Case - Black
Corsair 4GB DDR2 XMS2 PC2-6400C5 TwinX (2x2GB)
Samsung SpinPoint F1 320GB SATA-II 16MB Cache
Tuniq Core Contact Freezer CPU Cooler (Socket 754/939/940/AM2/LGA775)
Edimax EW-7728IN nMax 300Mbps Wireless Desktop PCI Network Adapter
Pioneer DVR-216DBK 20x DVD±RW SATA Dual Layer ReWriter (Black)
 
Yes. Nothing looks mis-matched but the OCZ PSU doesn't have the highest reputation. Should be within spec though, but it does look like a power issue to me. As mentioned above the best test is substitution, so either another GFX card (lower spec so it draws less power) or the PSU swapped would tell you an awful lot. Without that you're left guessing. If that's impossible you could try reducing the load as much as you can. Disconnect everything except your CPU, GFX and HD - even case fans (not CPU fan of course) - anything to reduce the load on the PSU. Remove any add-in cards and use 1 stick of RAM. Then see if it will POST and BOOT reliably.

Oh., prior to that you might try unplugging and re-seating each and every connection to motherboard and GFX card. It's often the simple things that are root cause of problems like this...
 
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the psu is brand new so i would hope theres nothing wrong with it,, ill try powering up without things like internet card etc and see what happent. ill also try un-plugging and replugging stuff
 
your a genius it worked
without the fans and internet card and cd-drive it all works... does this mean i need a new psu instead? it's brand new.. is it simply not powerful enough?
 
It should be more than powerful enough, it might imply its faulty with not enough amps coming off the 12volt rail, only way to test is with a multimeter though
 
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The other possible thing is with all the PCI slots in use you may need to bump your NB voltage a bit, that might help, assuming the PSU to be OK
 
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Theres a setting in your BIOS, called NB voltage, or northbridge, your motherboards northbridge (NB) controls other interfaces, if lots of them are in use then you need more power to run them, so by increasing the voltage in your BIOS it should help, you could also try your SB southbridge if that doesnt help, this affects things like USB
 
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