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Swapping my case having huge problem..


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#1
betterwork

betterwork

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I am currently upgrading my case to a bigger and better looking computer case. So far I haven't got very far at all. I think I may have blown my cpu but I was wondering if I could get some opinions. Ok so when i started building my computer I had my Mobo, Ram, Graphics card all plugged into my new power supply that came with the case. When i flicked the power on I got no response at all when pressing the power switch.

I then realised I needed to plug in the Pwr sw connector onto the front panel on the mobo. I did this and flicked the button and yay power to my fans and all. The problem was when I tried to turn it off it just got faster so I kept pressing it and it just got faster until it smoked at which i pulled the power (it smoked for approx half a sec) I am not sure If I had the power sw in the right pin as it has no labels on my crap acer motherboard.

Now when I turn my computer on I get power to everything and there is no problems with smoking or anything the only problem is I can't use the normal switch at the front. I have to use the power switch at the back, as soon as my computer gets power it turns on but I get no POST whatsoever no signal to monitor. I tried switching to another power supply but when I put the power cable in (It has no switch) nothing happens when I press the power switch or anything...

I will say that I tried putting the clear cmos jumper to 2-3 but not sure if that works if I get no post? Also my ram and graphics card works perfectly last time I used it before swapping it to new case. I have run out of ideas on what to do. :tazz: I tried putting the power sw connector in most of the pins but no combination works. I am thinking either the mobo or cpu is fried or damaged as i dropped my old case the other day about 30 cm onto carpet but I doubt that would have done anything.

So tomorrow I think I might buy a new mobo and cpu since I only have a celeron.. lol unless you guys have any suggestions? Please help!
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#2
Doby

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Hi,

Your cpu and cards should be ok, but you may have blown the mobo by connecting the switch to the wrong pins. A case shorting the mobo on the underside would also act like this

I would go to the Acer website and see if you can find what mobo it is and then goto the mobo manufacturers website for a manual this will tell you the correct pin config, the pin assignments could also be printed very small on the mobo.

I would also (to eliminate a case short) take the mobo out of the case and lay it on a piece of cardboard then connect only the bare necessities and try to power on before I would give up on the board.

Rick
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#3
betterwork

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Hi

Just wondering what exactly is a case short and how do i avoid it? I have taken it out and tested it and today I took it to the computer store. They tested my mobo and cpu and they are both dead. They think it might be a faulty power supply causing all 240v of power to hit my mobo instead of the 12v required. I am taking power supply in tomorrow to check the volts, I also hear a very slight clicking noise when the power is off but still connected it sounds a bit like a electric fence.
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#4
Doby

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A case short is when the underside traces of the mobo touch the case, studs attached to the case between the mobo prevent this but most times they are metel them selves so you need to be very carefull when installing the mobo that these studs are in the correct place and line up with the srew holes on the mobo.

I know this sounds simplistic but you would not believe the amount of times it happens, if a stud is mounted in the case and does not line up with a screw hole on the mobo you lay the mobo in place you can no longer see the stud and assume everthing is in place but the stud touches the traces on the board and bam you got a short.

To avoid just be careful and double even triple check

I am not sure about the clicking maybe a noise from the psu.
Sorry for your misfortune.

Rick
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#5
betterwork

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Hi just to let you know I found out that the power supply was completely faulty. Took it into the pc shop today and it started smoking on the bench. I am hoping the seller will pay for some of the damage caused by their faulty product. I am quite sure it was not touching the case as I have a mobo panel that comes with the new case but hey.. looks like the problem has been discovered.
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#6
Doby

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Goodluck I hope you get something back

Rick
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