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Issue with newly built HTPC

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August 8, 2010 10:59:53 PM

Hello,

I am building my first HTPC (my first computer as a matter of fact).

I finished building it and when I tried to power up for the first time, The power seems to reach the mother board intermittently.

It gets power for a second, the led lights up, the fan runs ...then it stops ....then after a second it gets power again.

I can see nothing on the screen..

The configuration is:

Gigabyte GA-P55M-UD2 Mobo
Core i5 750
4 gig DDR3 Corsair xms3
1TB Western Digital Caviar Black
Corsair Tx 650 Watt PSU
Zonet 802.11 Wireless PCI Adapter
Radeon HD 5570 ATI cross fire x Graphics card
LG super Multi Internal Blu-Ray optical drive.

Help!

Regards
Subrat

More about : issue newly built htpc

Anonymous
a b B Homebuilt system
August 8, 2010 11:11:07 PM

I'm not sure, but, it sounds like a bad PS (power supply)
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Anonymous
a b B Homebuilt system
August 8, 2010 11:19:38 PM

either a bad PS or actually check connections as well as the supply setting (110/240). If you try to run a PS that is set at 240 and your outlet only supplies 110, then that could be an symptom. if it's reversed, then POP goes the PS! hmmm.. lemme know what happens :) 
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Best solution

a b B Homebuilt system
August 8, 2010 11:56:16 PM

Also, double check the standoffs that secure the motherboard to the case. You may have a short.

You can do what's called breadboarding by removing the motherboard from the case, connect PSU, one stick of RAM, video card, CPU+HSF, and try to start the system by bridging the two pins for the power switch with something like a screwdriver.

Be sure to do this on something non-conductive like cardboard.

If the system starts up, add things one-by-one until you have everything in the case. If it still displays the behavior you described, you can test the power supply using the "paperclip test". Good luck.
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August 9, 2010 1:42:57 AM

Okay guys, it turned out to be a Typical rookie mistake!

I had not connected the 12v ATX!!! ...what made it more tricky was that it was a 8 pin connector, but only 4 fit, but that seems to suffice! Thank you shortstuff_mt

I have loaded the OS (Windows 7) and am off to the races...

My next challenge is how to connect 2 fans (the case has 2), but as far as I can tell the Mobo has only 1 fan connection!. It is running with 1, but it looks like it is running hot ..and I need to figure out how to tie up all the PSU cables that I anot using away so that the HDD does not get too hot.
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Anonymous
a b B Homebuilt system
August 9, 2010 2:20:35 AM

You should get a temp monitoring software. Hardware would be even better. However, it's common for a CPU to run about 120f give or take. that's pretty warm to the touch. you should look up yours and see what the temp averages are....
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August 19, 2010 10:01:18 PM

Best answer selected by smishra.
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