New card, PC won't start

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superjank

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Jun 7, 2014
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Hi Tom's users - I have read multiple threads on this exact topic but no one can seem to provide any solid answers or feedback relating to a certain problem I have.

I have a build as follows:

CPU: AMD FX-4130 Black Edition (Vishera 3.8 GHz, quad-core)
MOBO: MSI 760GM P34 FX
RAM: 2x Kingston 1666 DDR3 4 GB
HDD: 1 TB 7200 RPM Drive
PSU: 450w "Ultra" psu (came with case)

I used to have a Radeon R7 240 - it worked perfectly with my system. However, I was wanting a little more power so I upgraded to the GeForce 750 TI (2 GB, GDDR5). However, with the card plugged into the PCIe 2.0 slot >AND< connected to the 4-pin 12v power connector, the computer will not power on AT ALL. This means no lights, no beeps, no fans, NOTHING. However, there is a small green light on the actual graphics card that illuminates, and the system starts up just fine with the 12v cable unplugged from the card or with the card removed completely. I have a 12v cord attached to my MOBO as well as the card when it does not start up.

So, with this information, I have concluded:
-The PSU isn't bad, since it ran my old card and can run the system without the new card
-The actual card isn't bad, because the power light and the fans initialize on the card when the 12v power cable is UNPLUGGED
-The PCIe slot isn't bad because it ran my old card just fine
-The MOBO isn't bad, since it runs just fine without the card.

My only conclusion can be that the power supply's 12v cord is somehow faulty (even though it clearly provides power to the card and motherboard) or that the system is somehow just not set to draw enough power at startup.

It should not have anything to do with software (drivers, etc.), since the entire system will not even boot with the card installed.
 
Solution
notherdude

Good point, even though the Nvidia card isn't very power hungry the cheap 'case' PSU could still be the culprit. I'd try another one first thing.

EDIT: And if none of this helps then maybe the new video card is simply defective.
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smorizio

smorizio

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Jan 22, 2010
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with some newer gpu it may be a bios issue on the motherboard are you running the newest bios file on the mb. also look at your power supply see what the 12v rail is rated for in amps and watts. see if the gpu and cpu are not pulling more then that cheap power supply is rated for.
 
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notherdude

notherdude

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Jul 18, 2006
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I don't have a specific answer and I'm a little unsure if these things could even affect the situation since, as you pointed out, the MOBO isn't even trying to get into BIOS but have you a) reset CMOS and/or b) updated the mobo BIOS? I think on general principles I would try that anyway.
 
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notherdude

notherdude

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Good point, even though the Nvidia card isn't very power hungry the cheap 'case' PSU could still be the culprit. I'd try another one first thing.

EDIT: And if none of this helps then maybe the new video card is simply defective.
 
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superjank

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Jun 7, 2014
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I checked the BIOS and it's up to date, doesn't seem to be that.

I did forget to mention that my mobo doesn't save the CMOS settings whenever it is unplugged from an outlet. For instance if I boot up my computer and set the CMOS settings (time, date, etc.) and save them upon exiting BIOS, the computer will remember my settings and boot straight to Windows as long as the PC stays plugged in to the wall. However, if I unplug it for more than a few seconds and boot after replugging it in, the settings get reset every single time it's unplugged.

I checked the JBAT pins and there seems to be something missing according to my mobo manual - they are just two bare pins sticking out but the manual makes it look like it should have some sort of cover to connect them. This could have something to do with my issue at hand but I don't see how this problem of the resetting cmos (which I've had since I got the mobo) didn't affect the R7 240 nor does it seem to affect any other component of my computer.
 
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smorizio

smorizio

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Jan 22, 2010
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if you have local radio shack or computer store they do sell cmos or mb jumper. when you lok at the mb guild and the mb there two types of cmos clear set ups. a 3 pin set up (1/2/3) and a two pin set up (1/2). with three pin set up the jumper is on 1-2 normal and with the power off move the jumper to pin 2-3 to clear. with 1-2 pin set up the jumper on to run and off to clear.
 
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superjank

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Jun 7, 2014
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I solved the problem - the card required a SIX-pin 12v plugin, and my mobo only had a FOUR pin cord - the 4 pin cord will power on the LED light for the card but not start up the actual card I guess :/

I purchased a new Ultra 500w psu with a 6-pin cord and now the whole system starts up and the card runs my games fine.

Thanks for all of the replies, hope this helps anyone else with the same problem.
 
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notherdude

notherdude

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Damn, I tried in vain to get a picture of that card's power connector to see if it was six or four. I worried when you said 4 pin but I assumed you would have seen the extra pins unfilled. Oh well, glad you got it.

 
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