The system fails to boot up after a new power supply was added
Well I just added a new, much more powerful power supply to my system. The problem I'm having is that the system now will not boot up. It turns on for about 1 second before then shutting right back down. I tested every connection individually and found that the cord that connects from the rightmost side of my power supply (A blue 8 pin to the right of the main 24 pin motherboard power supply) is what is causing the system to fail. Upon trying to boot it up with this unplugged, it works, but I get no display, and seeing as the 4 pin connection it runs to is just to the left of the GPUs (I have dual with SLI), I'm assuming this is the connection that powers them.
System Specs: 3 GHz dual core pentium processor 3 gigs of DD2 RAM dual GeForce 8600 GT graphic cards connected with SLI card Five cooling fans, two LED. The new power supply is a 950W, the old was 600W. This new one uses the detachable wire bundles whereas the old had all the wires connected inside the system.
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Re: The system fails to boot up after a new power supply...
There should also be a brand - the nVidia just relates to the chipset that the board uses, but its OK, lets check the wiring first. If we still have trouble I'll get you to double check for the brand name.
Lets just check that you have the following plugs in place:
The 24 pin plug from the PSU (blue) to your motherboard - this powers the board itself.
A 4 pin 12v P4 connector plugs into the motherboard (near the CPU). This is the CPU power. It runs from the 8pin blue socket on the PSU. Make sure that the end plugging into the motherboard is only 4 pin.
No power cables required to run the 8600GT so the red sockets on the PSU are empty.
Power cables going to all your peripherals (hard drives and CDroms). These run from the black sockets on the PSU.
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If new video card requires power from new power supply (look for square connector), you will not boot until you make that connection. If you give additional details about "no longer boot", like the symptoms, I'll try to help you.
Hi, maybe a number of many things unfortunately. Have you installed new into your computer? (RAM, Graphics Card ,etc...).
If so take it out and restart the computer and see if it will boot up. If this is the case then you probably need a more powerful Power Supply Unit. If nothing has been added then a possibility that the Power Supply Unit is now failing, computer is overheating - check vents are not covered up with dust, objects etc.., the thermol paste between the Processor Chip and Heat Sink may have dried out and lost the contact between them, Motherboard could of failed.
Like I said before it could be a number of things but these are the most common.
Could be 3 things Memory or CPU or Powersupply. are you getting any beeps if so how many, how long. try taking all the memory out and powering up see if it beeps if so try to put one stick of memory in at a time and see if it will boot. if you get no beeps with memory out check powersupply some PS's have a red switch on back for current input. switch back and fourth about 20 times uning a pen and set it to the right current for you location. put ram back in see if it will boot if not its trial and error of the PS and the CPU replacement and it still could be the RAM giving false readings. yea i know sounds like a ball of fun.
If you are getting solid or flashing lights but nothing else then you most likely have a bad power supply or defective motherboard. I would take this time to inspect the motherboard (mobo for short). It should not have any capacitors (they look like tiny soda cans) that are bulging at the top, swollen at the top or leaking any kind of fluid. They should be perfectly flat. If your motherboard looks good then I would get a new power supply. You will want to take out your old power supply and look for the output watts. It will probably be in the range of 150 to 300. You must buy a power supply that has more than what you take out, never less. If you have put in a bigger video card or have a lot of cards that you have added to the system you will want to increase the power supply over 400 watts. This has been my fix for this problem. Let me know what you find out. Also if you get the computer to boot even once take that opportunity to get your files off immediately. A bad power supply can sometimes cause other parts to fail. Also a bad power supply does not always mean no power. Sometimes it can mean not enough power to power up the system. You could also try removing other components such as memory, cables to drives, etc. to see if that changes your boot up progress.
You are drawing too much current from the power supply with the current hungry fan.Try using a different fan that draws less power on start up. Or use a limiter to lower the input voltage draw on start up. These are usually found in fan speed controls You could also use a voltage dropping adaptor like the one use to quite fans down . They drop the 12 volt voltage to 7 volts by connecting the two voltages usually found on the power connector 12v and 5v and and adding them together getting a 7 volt output. You can also try connecting the fan directly to the power supply and avoid using the motherboard connector.The problem with this is you will not get use of the speed controling sensors used in the motherboard connections. Hope this helps you with your problem.
Sounds like the power supply is failing. The power supplies have protection circuitry in them so that when there is excess current draw, the output voltage is 'clamped' (reduced to a lower level) so that the power supply won't burn up. If you are consistently experiencing this, that's a sign. If you added another drive, a new video card or upgraded the processor a little while ago, the power supply might not quite be up to the task. Even with nothing new added, a lot of power supplies don't like to be operated at much over 60@ of their 'rated' capacity, and their ratings are significantly lowered at any little temperature rise.