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System won't boot, no idea why?

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April 3, 2011 5:16:26 PM

Hi it's me again,
I have a win7 ultimate system that had been giving me trouble when rebooting, it would hang on the shutting down screen forcing me to hit the reboot button on my system. Last night my game(SWG) was lame so I decided to shut my system off for the first time in god knows how long, this morning I wake up start the system and it hangs at the first screen where it shows what motherboard and cpu I have installed and won't go any further? I get the one beep like it's starting ok, i here the hdd spin up but nothing else happens once i see that screen, if I hit the reboot button the system shuts down but never restarts, no first beep nothing?

I've gone thru the system, everything seems to be seated correctly,. I blew all the dust out of it but the same thing keeps happening, when its off I can start to the first screen with the first beep but rebooting doesn't show anything but a black screen?

I really have no patience for troubleshooting my own system, and have no idea what could be the problem now? This is really really ticking me off! I should be ab le to turn the POS off when I feel like it and have it restart the next day, right?

Any and all help will be appreciated, before I throw this system against the damn wall!

System is as follows:

GIGABYTE GA-MA785GM-US2H AM3/AM2+/AM2 AMD 785G HDMI Micro ATX AMD Motherboard

AMD Athlon II X2 250 Regor 3.0GHz Socket AM3

2 Western Digital Caviar GP WD5000AACS 500GB SATA 3.0Gb HD\\\'s

CORSAIR XMS2 4GB (4 x 1GB) 240-Pin DDR2 SDRAM DDR2 800

Antec BP 550 Plus PSU

Win 7 Ultimate

More about : system boot idea

a c 122 B Homebuilt system
April 3, 2011 5:37:39 PM

Well, you are going to need to be patient.

Work systematically 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. We spent a lot of time on this. It should find most of the problems.

If not, continue.
The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

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: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%. If you have a white wire (many modern PSU's do not), it should be -5 volts.

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.

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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April 3, 2011 6:21:14 PM

After going thru the system again, reseating everything including all cables and connectors, I turned it on and still only one beep, then I shut it off and on again and the stupid thing started? No idea what caused the problem, considering it was just sitting there, off all night? No one was near the cables or the PC at all??

Now I'm afraid to reboot it or shut it off for fear of it not starting again?
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Related resources
a b B Homebuilt system
April 3, 2011 6:37:51 PM

alazeer said:
After going thru the system again, reseating everything including all cables and connectors, I turned it on and still only one beep, then I shut it off and on again and the stupid thing started? No idea what caused the problem, considering it was just sitting there, off all night? No one was near the cables or the PC at all??

Now I'm afraid to reboot it or shut it off for fear of it not starting again?

If you can get into BIOS, check the voltage of your RAM. Make sure that the Motherboard is supplying the correct voltage for your ram. If it is under-volted, results are unpredictable. :ouch: 

Corsair Ram tends to require higher voltage. :pt1cable: 
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April 3, 2011 9:35:21 PM

clarkjd said:
If you can get into BIOS, check the voltage of your RAM. Make sure that the Motherboard is supplying the correct voltage for your ram. If it is under-volted, results are unpredictable. :ouch: 

Corsair Ram tends to require higher voltage. :pt1cable: 



Looks like the voltage for all four sticks is set to 2.1V, which it has been since they were installed.

Any idea how to get win 7 ultimate back to rebooting like it once did? Every time I restart the darn thing it hangs at the shutting down screen. From what i found out online there really isn't any kind of fix for this and it usually happens after a MS update, which is what happend to mys syetm. Do I have to wait until the next update comes out from MS to fix this? What a PIA it is!
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