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Faulty PSU?

post #1 of 6
Thread Starter 
I've tried everything I can think of but my computer will boot, fans running, hdd turns on, etc. but no video displays on my monitor and if I unplug and plug in a VGA cord or DVI I get a no DVI/VGA etc signal.

USB ports don't work either when I turn on the computer, keyboard/mouse doesn't light up. Also tried booting with the 24pin and 8pin just in, same result. The fan headers on the mobo work also.

I have tried the integrated graphics and graphics card to no avail. Reset CMOS, had no graphics card in, same results.

Monitor works as I tested it with my laptop.

I really don't what to do or even replace at this point.

- i5-3570k - ~year old
- Asrock z77 pro4 - brand new
- evga GTX 780 - ~3 months old
- Seasonic X 650W PSU - ~year old

Any ideas? I ordered a speaker to plug in my motherboard and it will be here Tuesday of next week so I can get a beep code.

I think my PSU is not delivering enough power to the CPU or motherboard.
post #2 of 6
Quote:
Originally Posted by mercs213 View Post

I've tried everything I can think of but my computer will boot, fans running, hdd turns on, etc. but no video displays on my monitor and if I unplug and plug in a VGA cord or DVI I get a no DVI/VGA etc signal.

USB ports don't work either when I turn on the computer, keyboard/mouse doesn't light up. Also tried booting with the 24pin and 8pin just in, same result. The fan headers on the mobo work also.

I have tried the integrated graphics and graphics card to no avail. Reset CMOS, had no graphics card in, same results.

Monitor works as I tested it with my laptop.

I really don't what to do or even replace at this point.

- i5-3570k - ~year old
- Asrock z77 pro4 - brand new
- evga GTX 780 - ~3 months old
- Seasonic X 650W PSU - ~year old

Any ideas? I ordered a speaker to plug in my motherboard and it will be here Tuesday of next week so I can get a beep code.

I think my PSU is not delivering enough power to the CPU or motherboard.

Do you have another PSU to swap with just for troubleshooting. In any case yes it does sound like it could be PSU. Which is strange cause Seasonic are known for high quality PSUs.
Whats the amp rating on the 12v line? Maybe not enough for that 780?
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My AMD pwnage
(18 items)
 
  
CPUMotherboardGraphicsRAM
FX 8350 Asrock 990FX Extreme 9 Sapphire 7950@ 1080/1370 Replacing RAM soon 
Hard DriveHard DriveOptical DriveCooling
Kingston HyperX 3K 120GB SSD 500GB WD Blue Generic iHAS120 ATAPI DVD-RW Cooler Master Eisberg 120L Prestige  
OSOSMonitorKeyboard
Win 8.1 Enterprise x64 Trial version Linux Mint 15 MATE in Virtualbox Sony E540 CRT 21" Logitech G510 
PowerCaseMouseMouse Pad
TT ToughPower 775W TT Dokker Razer Deathadder Rocketfish 
AudioOther
Asus Xonar D2 Fan controller for FM121s 
  hide details  
Reply
post #3 of 6
Thread Starter 
Quote:
Originally Posted by CptDanko View Post

Do you have another PSU to swap with just for troubleshooting. In any case yes it does sound like it could be PSU. Which is strange cause Seasonic are known for high quality PSUs.
Whats the amp rating on the 12v line? Maybe not enough for that 780?

No PSU to test. I can order one from amazon and try it. If it works I can RMA the Seasonic and use the replacement PSU from amazon until I get my seasonic back...

+12V@54A - more than enough as I have been using this setup with the 780 for 3+ months, no problems, even overclocked it alot.

When I pull the 780 out and just try the integrated i5 ivy graphics I get no signal, so it has to be the PSU as the computer wouldn't even boot if it was the CPU and the mobo is brand new as I bought it to test the mobo first (unless the two mobo's I have are dead lol)
Edited by mercs213 - 9/1/13 at 12:25pm
post #4 of 6
Thread Starter 
Update!! Really strange, got a mobo speaker, plugged it in and no initial beep, no nothing.
post #5 of 6
Are you absolutely sure there's no short between the motherboard and case, both around the mounting holes (check top and bottom of each) but also at the corners? Mobos and cases can flex enough to let the corners touch, and sticking rubber or plastic bumper feet to the corner at the mobo cases can prevent such shorts.

Is the heatsink mounted flush against the CPU? Lack of good contact will prevent some motherboards from starting, despite the fact that modern CPUs cannot be damaged by heat.

If there are any USB ports connected through cables, unplug those cables, just in case the 5th wire of any such port is for sensing current, rather than for a ground connection. That can cause a direct short between +5V and ground.

For some odd reason, many new PSUs I've tried in the last year or so didn't work on the first try but did work after I unplugged and replugged the power connectors several times; it's as if the contacts were coated with something. This included a Corsair CX430 (by Channel Well Technology) and a 620W Antec (by Seasonic).
Edited by larymoencurly - 9/3/13 at 6:16pm
post #6 of 6
Thread Starter 
Quote:
Originally Posted by larymoencurly View Post

Are you absolutely sure there's no short between the motherboard and case, both around the mounting holes (check top and bottom of each) but also at the corners? Mobos and cases can flex enough to let the corners touch, and sticking rubber or plastic bumper feet to the corner at the mobo cases can prevent such shorts.

Is the heatsink mounted flush against the CPU? Lack of good contact will prevent some motherboards from starting, despite the fact that modern CPUs cannot be damaged by heat.

If there are any USB ports connected through cables, unplug those cables, just in case the 5th wire of any such port is for sensing current, rather than for a ground connection. That can cause a direct short between +5V and ground.

For some odd reason, many new PSUs I've tried in the last year or so didn't work on the first try but did work after I unplugged and replugged the power connectors several times; it's as if the contacts were coated with something. This included a Corsair CX430 (by Channel Well Technology) and a 620W Antec (by Seasonic).

PSU and CPU are dead.....

My PSU can't power my friends computer, no video displays.

When I put my CPU in his mobo with his power supply, no display either.

When I put his CPU in my mobo, no display either with my PSU.

frown.gif
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