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Getting no boot/power

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July 31, 2010 8:52:19 PM

Hi all I have just finished putting together my new build with these parts:

CPU: i5 750
MOBO: GIGABYTE GA-P55A-UD3
GPU: SAPPHIRE Radeon HD 5830
PSU: SeaSonic X650 Gold
Memory: CORSAIR XMS3 4GB(2 X 2gb)
Storage: Western Digital 1TB
Drives: Lite-On DVD
Case: Antec 300
Os: Windows 7-$100

I read all the manuals and was sure to install everything properly and when i went to boot up I got no power. So I checked out the guide on steps to perform if having problems so I took everything apart again and basically rebuilt it and still nothing. I just see a flicker of the LEDs once I power up and nothing happens. This has happened both times. I really have no idea what to do, any help is appreciated.

More about : boot power

a b B Homebuilt system
July 31, 2010 9:53:27 PM

do any of the fans spin?

If you take out the video card and the memory does it BEEP?

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July 31, 2010 9:56:03 PM

no fans spin, there really isn't much time the power is on. It is essentially a flash of LEDs, for less than a second, and then nothing.
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July 31, 2010 10:18:03 PM

I was JUST having this problem, seems it can be anything. I took out my video card, turned out to have overheated in the night.
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July 31, 2010 10:33:06 PM

I haven't gotten a first boot though so I really have no idea where to look. Also I have no system sound hooked up so I wouldn't hear a beep. I need help please I really want to get this thing booting
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July 31, 2010 10:54:37 PM

uninstalled my pci-e card and tried to see if it would boot with no luck, the same thing is still happening.
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August 1, 2010 3:09:03 AM

1.Did you install all your motherboard standoffs correctly and did not over tighten while installing the board.

2.Both power supply plugs are connected to the motherboard? There are 2!

3.Cpu fan is plugged into the cpu fan header on the mobo?

4.Remove one stick of ram make sure the other is firmly installed, push down on the ram stick until the locking tabs flick up by themselves, this may require more pressure on one side of the stick then the other, dont brute force push down on both sides at once.

If you still cant post switch the other ram stick in and try again.
If that doesnt work you have a failed component. Most likely your mobo.
Even if your Vid card is faulty the comp will still spin up and post you just wont see image of it.

If your Ram, Mobo and Cpu are installed correctly with all power supply plugs installed correctly you computer will post. It wont go any further but it will post.




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a c 122 B Homebuilt system
August 1, 2010 8:39:01 PM

Work through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it.

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

The breadboarding thread has a paragraph about how to build and test a PC in stages.

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You really, really need a case speaker. If your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

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.

At this point, you can sort of check the PSU. Try to borrow a known good PSU. 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: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

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...

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 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. Silence or long single beeps indicate a problem with the memory.

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.

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.

Other comments:
Problem is probably not the CPU. And you have one of the best PSU's on the market, so I would be very surprised if the PSU was the problem.
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