Motherboard works at tech shop but does not work at home?

April 24, 2012 at 06:41:02
Specs: Windows XP, Athlon 64x2
Hi everyone, I have a strange situation on my hands. My AMD 4800+ system had a problem a few weeks ago, it stopped displaying anything on the screen (powered on, fans were spinning, no POST) Funny thing was that if I took the graphics card out, it would beep an error code indicating no graphics card. Anyhow, I swapped the graphics card with a new one, still didn't work. Tried different ram, no luck. At this point I went out and bought a second-hand motherboard (same as the old, Gigabyte M55Sli-s4 but this time a revision 2.0). Transferred the CPU, RAM and power supply (550W) over to this board...and what do you know, still didn't start up! It had the same symptoms as the previous board. Frustrated, I went and bought a CPU of an auction website thinking that the old CPU was gone. Replaced the CPU, still no boot! Nothing on screen. Had a hunch that maybe both motherboards were bad, my brother then went and bought a brand new ASRock motherboard. We transferred the old CPU, RAM, graphics card and power supply to this new board and woohoo it powered up perfectly! So I took the second hand motherboard (which I deemed was faulty) back to the shop I got it from. They were very condescending. The 'tech'(a random stores guy) fiddled around with it at the back and then 10mins later asked me to come have a look - and to my surprise it was running fine! Anyway I had to take the board home because according to them, there was nothing wrong with it. And I tried again by transferring the parts which were now working on the new ASRock board back to this board again to test it, and it doesn't boot! Can anyone shed some light? What can be wrong? Why does it work at the shop and my home? Argh

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#1
April 24, 2012 at 07:09:29
"and power supply (550W)"

How about posting the make/model & amperage specs?

Are you benchtesting this hardware 1st? or are you slapping everything into the case, then testing it?

http://www.techsupportforum.com/for...


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#2
April 24, 2012 at 07:49:31
Hi...yes the power supply is a Seasonic (not sure of the model details - will check) anyhow I tried it with another power supply too, a brand new Thermal Master 350W. Both these PSUs worked fine with the brand new ASRock motherboard.

I tested it both inside and outside the case.


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#3
April 24, 2012 at 09:35:45
I assume the hardware is testing OK outside the case, right? Because it wouldn't make sense to put non-working hardware in the case & expect it to work.

If it works on the bench but not in the case, the problem would have to be with the installation. Possibly there's a motherboard standoff in the wrong location & it's shorting out the underside of the board?


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#4
April 24, 2012 at 09:50:41
u sure did a lot of replacing and removing of hardware...
it works with the ASrock motherboard probably uve done a good installation and to ur luck the boards capacitors are sitll sane
whilee the other boards there could be a problem with the installation do the fans spin when u turn the pc on ? is the motherbaord light on ? what do u mean fideled with it ? he could have straightened some caps

computers are a second home
NVIDIA GeForce
GS_Toxict51


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#5
April 24, 2012 at 13:29:35
I'd begin to wonder about the house electric system. You'd need a very specialized and well trained electrician. All of them have tools to test voltage and frequency. You might need one that can test the quality of the harmonics. It could be that something in your home or nearby is creating unstable harmonics.

Text, talk, drive...CRASH.

Hang up and drive @#$%^^


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#6
April 24, 2012 at 13:30:12
Well I tested it inside and outside the case, regardless it does not work. It doesn't work on my bench at home but it magically worked at the tech shop (they were using their own CPU,RAM and PSU since I only took the board with me with the intention for a refund)

The case I think is fine because I've installed the ASRock board into it and it works.

:(


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#7
April 24, 2012 at 13:36:58
Hi toxic...yes everything works fine with the ASRock board, but if I use the same hardware with the Gigabyte board then it's totally kaput. Yes the fans spin, there is no POST beep (but if I remove the graphics card it beeps 1 long and 2 short to indicate missing graphics) Well the 'technician' took it to the back and I don't know what he did to it, he said he just plugged in RAM and CPU and graphics and all was good (he showed it to me starting up and running. Regardless it doesn't run for me at home!

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#8
April 24, 2012 at 13:41:14
Hi jefro...yes I considered that could be a problem! Our house is new and it was built during the housing boom here around 2006...and the wiring doesn't seem to be done well, some light sockets don't work in a few room, and bulbs keep dying out at a high rate. Hmm maybe it's worthwhile getting it checked. However if it is, it doesn't seem to have affected the other PCs in the house or the TV or etc.

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#9
April 24, 2012 at 13:49:43
Your clue that the processor was OK was the beep code for no video card. If the CPU was bad you would get nothing at all. You bought lots of hardware but you should have started with the power supply.

When you installed a working board into the case did you then connect everything up to it? Your should not do that.

All that is needed to POST are the following: Power supply, motherboard with CPU/HS/fan, 1 stick of RAM in the first slot, graphics (onboard preferred), monitor and keyboard. Computer should POST to an error stating no bootable device or something similar.

You then reboot and immediately enter the BIOS screens to check voltages and temperatures. 3.3V, 5V & +12V should all be within +-5% of those numbers.

Add in devices one by one. As riider stated above, you may have a short. If you have a cheap case that doesn't use screw in standoffs but has raised bosses stamped in, you MUST use insulating washers between the board and the case.

If your case uses metal screw in standoffs they MUST be installed under every screw hole and ONLY under screw holes. Standoffs MUST also be the correct length. If you have to force the board ports through the back plate them you may not have the correct standoffs installed.

A defective CD or hard drive can keep the computer from POSTING. Also, connecting additional hardware wrong can cause the same issues.



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#10
April 24, 2012 at 14:36:28
Hi OtheHill...yes I didn't connect anything extra, only the CPU, one ram stick, PSU and graphics card. Also tested it outside the case, swapped the ram modules, swapped the PSUs, swapped the CPUs and graphics card and what not, no boot. Like I said all these parts work with the new ASRock motherboard...it doesn't make sense! And these parts are compatible with the motherboard, I've checked and double checked. Maybe those guys at the shop were trying to pull a fast one on me :(

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#11
April 24, 2012 at 14:39:25
Start at the beginning with the why of things.

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#12
April 24, 2012 at 17:24:06
I guess if you have some friend that you could go over and replicate these tests it might help.

Dunno about some of these small shops. Could be bad.


"and the wiring doesn't seem to be done well, some light sockets don't work in a few room, and bulbs keep dying out at a high rate."

You need to get this issues investigated by a professional. I can't say from here if there is an issue or not. Light sockets should work for 20 years or more.


Text, talk, drive...CRASH.

Hang up and drive @#$%^^


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#13
April 24, 2012 at 19:22:56
Poor unclean power is not good for electronics, but the last board you purchased new may be more tolerant of this (at least for now). This may be temporary though. Have the electrical system tested and consider getting a UPS which is much better than a surge suppressor since it is capable of smoothing out the power getting to your power supply due both to better circuitry and the battery back up.

You have to be a little bit crazy to keep you from going insane.


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