changed motherboard, computer wont start up fully.

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fireboy1

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Sep 28, 2013
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hi my name is James and I am a firefighter for my city so my responses may be a slow but I assure I WILL answer.
I had an off the shelf Dell XPS 8700. The motherboard died so I replaced it with a Gigabyte z97x gaming 5 but kept the i7-4770 3.4 ghz processor with the tundra TD02-E water cooler. I installed a saphire R9-270 2gb graphics card. I have a Corsair CX 750 PSU and the OP was and will be Win 7 Pro 64bit.
I am having is when I hit the power button, the system will start and then stop very quickly. the fans do not even have time to spin up to full power. The board lights up along with the cooler pump and all LEDs. The come on then turns right back off.
I went back and checked that each component is compatible with every other peripheral and all are. I have ensured the case power and HDD connections are on correctly. I have checked and rechecked that the PSU wiring is connected to each component properly. I have checked and rechecked the water cooler is installed properly as well as the CPU. I have examined the CPU and processor for defects and can't find any.
Am I missing a step or something? Is there a way I can check the CPU is still functional?
 
Solution
bailojustin


I'm glad we figured out it was the ram. Have you tried configuring your ram in different slots, many are color coded and I recommend before buying new ram to try them in the other slots and in the BIOS disable XMP. This may help, because in my personal opinion its very strange for 2 ram modules to go bad, its usually just 1, this leads me to believe it might be the motherboard itself.

Try the other 2 slots. If the same result get a cheap pair of ram and pop them in, if still no boot, return the ram, keep your original ram, and you now know to replace the MOBO and PSU.
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You can try a CMOS reset? Remove the power from your PSU, unplug it.
Look on your motherboard for the CMOS battery, take it out.
Hold the power button for 15-20 seconds
reinsert cmos battery,
plug back in PSU and power on computer.

Also make sure that you have the CPU_FAN is plugged in, and the CPU_OPT is plugged in.
The ram should also be placed in the 2 gray slots on the motherboard.
 
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james what you posted is the mb or power supply sees a dead short in the pc and is turning off to save itself.
start with unplugging each case fan and reset and power and hard drive led. see if there causing a short. then pull the gpu and then one ram stick. make sure the ram is locked in. on the edge of the new mb make sure the 8 pin cpu power plug is connected. on your power supply there two four pin connector that make up that 8 pin connector on the mb. the 6 plus two cables are for the video cards. on the case itself make sure there 9 brass standoffs under the mb to keep it from shorting out. also with new mb did you use the new io shield that was in the mb box?? if you did not see if the old one is shorting out. if you did swap them make sure it pop in and not shorting out the mb. if you cant get the mb to post right in the case. take it out and place it on top of the mb box see with one ram and onboard video it turns on. you may have to short the power switch pins.
 
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I actually never considered it could be a short circuit. I did install all of the stand off connections before installing the mb but I will definitely go back and recheck everything you listed.
You mentioned something about an IO shield. The only thing that came loose in the box was the screws for attaching the motherboard and a sli cable for attaching 2 nividia cards. could I trouble you to give me the general area on the mb where the IO shield located so I can check it?
 
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I have the ram installed in the 2 grey slots but I did originally have them in the black slots. I went back and found that the grey are slots 1 and 2. I will definitely try the your suggestion about the cmos reset.
I do have a question about the cpu_fan and the cpu_opt connections. Both of the connections are 4 pin on the board but the connections from the fan and the water cooler fans are both only 3 pin so 1 pin on the far right isnt being connected at all. Would that have any bearing on my problem?
 
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No it would not affect you, the 4th pin is just PWM. it is not really needed with your water cooling setup. And yes the fact that your ram was in the black slots and not the gray slots will cause your PC not to boot up, after placing them in the slots try to boot, if still nothing please reset cmos as explained, its quick and then turn it on. I can almost guarantee you will have a boot.
 
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OHHH Yes I did get one of those but I am sorry to say I did not use either the old on or the new because it was very difficult to get the board to line up with the stand off screws. I will go back and install it properly. I can not thank you enough for your help with this. I was at the end of my rope trying to figure out what I did wrong.
 
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My computer does not have the IO shield as it really is not needed in most cases, Sure it helps discharge the static but only if you keep the metal tabs against the ports themselves, and even then without 1 it should not cause a problem, the main reason for them as I have read is to keep dust and to keep the aesthetic aswell as its the main support for the ports while they stick out and keeps airflow in the case optimal.

If you really think it could be these all he should have to do is connect a jumper, anything metal from the case and push it against the ports, try to boot. if it does the same thing then you know its not the IO shield improperly grounding. if it was then that would mean that there was a much bigger serious problem somewhere in the board that is a short and requires an escape. if there is a short then the MOBO might aswell be toast.

 
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I will definitely try that as soon as our trucks get back into the station. I am the unlucky winner that gets to man the radios this shift. It shouldn't be to long before they are back. its only a 2 alarm. My computer isnt to far away its just I cant get to it at the moment. I will reset the cmos as soon as I can. Thank you so much for the help.
 
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Just to add to
26_032515.jpg
 
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This comment about the wire placement for the CPU pump for the water cooler. I have just a regular fan connected to the CPU_fan connection and the fans from the cooler connected to the CPU_opt connection. I have the pump connection connected to a 4 pin connection from the PSU. Could that be my issue?
 
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No as long as the fan slots are plugged in. Did you move the ram to the correct slots and afterwards reset the cmos yet?
 
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Please accept my apologies for taking so long to reply to your post, I am an officer with my city's fire dept and our calls have almost tripled to whats normal for this time of year.
I did try everything you asked me to try and it still would just turn on the right back off even after the cmos reset. A friend here suggested I examine the cpu and the cpu receptacle for any damaged and the pic is what I found. Look in the lower left hand corner just below the first tab. There are 3 pins that are bent out of place. Would this cause the on and off problem?

There was something else I found that was strange. When I would turn on the main power switch on the PSU the mouse would light up and stay lite up untill I turned the main power switch off. Is this normal too?

http://i.imgur.com/10xzdEL.jpg
 
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Your MOBO has usb power despite it being off, thats a normal MOBO thing they usually add. and I see the bent pins down in the left, I would use a magnifying scope and just barely try to align them straight, once straight they should slide into your CPU, make sure your CPU also has no issues underneath and you are positioning it correctly. also if your CPU socket has a lock, looks like a little bar on the side of the socket iteself, lift that bar when you put your CPU in and it should slide into place, once in, you lower the bar and this locks the CPU.
 
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Okay now I am just dumb founded. I have literally checked every wire in this case and even removed the motherboard from the case and still does the same thing. I ordered a replacement got here installed it and the same thing. I checked the power connections and wires and no nicks cuts or even a scratch. I reset the cmos per your instructions and still turns on then right back off. I have disconnected everything that isn't necessary to power on. no usb ports, dvd roms, speaker systems, fans or LED lights. the only things connected are the hard drive power switch cpu cooler and fans and that's it
Let me ask you this. If the ram memory or the cpu were bad would it result in this turning on then right back off before the fans even spin up to speed?
 
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Check your cpu itself for any bent pins. And the ram may be faulty, just test it with memtest86
 
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No bent pins but the memory is faulty. Both seem to be bad. If they are bad then I am pretty sure the when the PSU shot circuited it probably took it out too.
 
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most newer pc memory has life time warranty. go to the vendor web page check to see if it does. if it does fill out the rma paperwork and rma it. for the cpu intel cpu have a three year warranty if there a retail part. if the computer is a dell or pre built check to see if the town or the station got an extended service contract on it.
 
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I'm glad we figured out it was the ram. Have you tried configuring your ram in different slots, many are color coded and I recommend before buying new ram to try them in the other slots and in the BIOS disable XMP. This may help, because in my personal opinion its very strange for 2 ram modules to go bad, its usually just 1, this leads me to believe it might be the motherboard itself.

Try the other 2 slots. If the same result get a cheap pair of ram and pop them in, if still no boot, return the ram, keep your original ram, and you now know to replace the MOBO and PSU.
 
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