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New rig wont turn on

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  • Homebuilt
  • Power Supplies
  • Computer
  • Boot
  • Systems
  • Product
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a b B Homebuilt system
February 3, 2012 8:12:41 PM

hi. i put together a new computer and it wont seem to boot up. im still using some old parts like the CPU and case. the power supply is fine because i tested it on another computer. i was wondering what the possible problems could be. Thanks!

More about : rig wont turn

February 3, 2012 8:15:56 PM

A bit more information would be helpful. What motherboard, RAM? What are the symptoms? Any beeping?
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a b B Homebuilt system
February 3, 2012 8:33:19 PM

no beeping and nothing at all. my old power supply blew up taking with it the motherboard. so i bought these new items

psu - http://www.newegg.com/Product/Product.aspx?Item=N82E168... already tested this power supply on another computer and it works fine

hard drive - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

mobo - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

ram - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

graphics card - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

cpu - amd phenom x4 965 be
could the cpu be damaged from the previously blown power supply?

can the case power button be damaged from the blown power supply?

thanks!
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a b ) Power supply
February 3, 2012 8:49:04 PM

if the pc is getting power but no beep codes try removing all the ram from the system and see if you get a beep code, if it beeps simply try the ram sticks one at a time or in a different combination on the motherboard, you could also try removing the cpu, that too should give a beep code i believe.
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February 3, 2012 8:50:51 PM

It sounds like either the CPU could have been damaged by the blown PSU or you could have a bad motherboard. If you know anyone with a cheap AMD cpu lying around you should swap that in there and see if it works with that.
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a b B Homebuilt system
February 3, 2012 9:26:52 PM

how can i tell if my CPU is damaged from the blown power supply? the pins are all there and straight and i dont see any burn marks.
(also, im the only one with an amd cpu in the house. cant swap another cpu to test.)

also, if the cpu is damaged, the computer wont boot up at all? absolutely nothing happens when i try to power on. no fans, no sound, no lights, nothing.

thanks!
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February 4, 2012 1:31:57 AM

ShadyHamster has a good tip. Try booting with no RAM and see if you get any response from the motherboard. You can also try that CPU trick he mentions.
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a c 122 B Homebuilt system
a c 144 ) Power supply
February 4, 2012 4:25:34 AM

You probably will not see any signs of physical damage on the CPU even if it is blown.

First, take a look at this:
http://www.tomshardware.co.uk/forum/274745-13-step-step...
to see if you overlooked something simple.

Second, work systematically through our standard checklist and troubleshooting thread (tsnor's thread):
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

Third:
The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.
http://www.tomshardware.com/forum/261145-31-read-postin...

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire (standby power supply): 5 volts always on. The green wire should also have 5 volts on it. It should go to 0 volts when you press the case power button (this is also a good way to test the power switch and the associated wiring), then back to 5 volts when you release the case power switch. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The green wire should be 5 volts whenever the PSU is plugged in and the PSU switch is on. It will drop to about 0 volts when the case switch is pressed and go back to 5 volts after it is released.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card (unless you have on board graphics available). In that case, remove any card and connect the monitor cable to the motherboard connector.
Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
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a b B Homebuilt system
February 4, 2012 4:53:02 PM

ok thanks guys. i have RMA the motherboard. If i get the new motherboard and it still doesnt work, i will replace the CPU. I didnt want to buy the CPU first because its more expensive. The power supply is fine and i also tried to boot without the ram to no success. I will keep you guys updated in the following week. :wahoo: 
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