New custom-built PC stopped powering up

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February 12, 2010 at 00:42:31
Specs: Windows XP, athlon2 x2 5000+/2GB
Hi,
Last night all the parts I ordered for a new computer came, so I built it, powered it up and it worked fine, so I installed windows, then the drivers. Next it needed service pack 3 and I needed to go out, so I set it downloading it, came home a couple of hours later and the machine is totally unresponsive. Holding the power button wouldn't shut it down, pressing reset didn't restart it.
I switched it off at the power supply, left it a few seconds and turned it back on. The power light doesn't illuminate but all the fans start and I can hear the drives spinning up. It doesn't beep at all
There is a row of LEDs giving some basic POST info, but all the manual says it that LED 1 lighting up means 'CPU is in phase 1 power mode' and all four means 'CPU is in phase 4 power mode'
Mine is stuck on phase one power mode. The manual tells you no more than this; there is no troubleshooting guide so I'm really hoping someone can make some sense of this for me and make some suggestion! Bad MoBo? It's an MSI 785GM-E51
Thank you!

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#1
February 12, 2010 at 02:31:16
Did you tried to reset CMOS?
Try removing the CMOS battery and then give it a try.

Once upon a time the floppy disk was king.


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#2
February 12, 2010 at 02:53:24
Yeah u can try to disconnect other hardware like hdd. Start from the beginning. U didn't bother to list all your system specs like psu, video card etc.

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#3
February 12, 2010 at 03:16:52
Hi,
OK I it with no RAM, then re-seating the RAM. Tried a different PSU and tried disconnecting the HDD/optical drive. The graphics chip is integrated. I bridged the jumper to reset the CMOS, but none of these have helped so far - same symptoms every time.

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#4
February 12, 2010 at 03:24:02
OK it's a CiT 450U 450W PSU, an optiarc cd/dvd writer, and a hitachi hard drive. The RAM is corsair DDR3. I don't have the exact spec for everything listed here at the moment, sorry. I'll get mroe detail on anything if someone thinks it would help later
Thanks

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#5
February 12, 2010 at 04:50:34
I found the specs to your PSU. 8A on +12v1, 13A on +12v2? It's garbage! If it failed, it's very possible it took some other components out with it.

http://www.aone.co.uk/ProdInfo.ASP?...

You should have gotten something like thsi:

http://www.novatech.co.uk/novatech/...


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#6
February 12, 2010 at 06:23:35
Yes...it was built to a tight budget. I've put the PSU into another machine and it's been running fine for a few minutes now. If a PSU fails is that usually it, or are they often intermittent?
The PC I have literally has CPU, RAM, HDD and DVD drives in it, and that's it. its power requirements aren't massive, so it shouldn't be taxing a 450W PSU, even one as poor as this.
If it isn't the PSU, that eliminate pretty much everything except the MoBo and CPU doesn't it?

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#7
April 20, 2010 at 06:23:21
i purchased the same mother board used 2gbs ddr3 1066, 1 300gbs hd, 1 dvd rw drive but went cheap on the psu. a 380 w nu power. i used a watt calculator online to determine what wattage i needed and it stated around 280w so i figured using the knock off brand if i got 75% power from that psu i wouldbe good. while my system ran fine the first day but now it seems to be freezing up. however i did not install sp3. just sp2. in the process of starting all over with it but it just may be the psu.

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#8
April 20, 2010 at 09:41:45
I ended up returning the motherboard. They found a fault and replaced it. My system wouldnt even get as far as POST codes though so it sounds like a different fault. Are you getting BSODS, what are you core temperatures like? Any overclocking going on?

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