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New HTPC build won't start; ideas?

post #1 of 13
Thread Starter 
Just tossed together an HTPC. Plug everything in, flick on the PSU, then it powers up on its own without hitting the start button. Then it shuts down after two seconds.

Did some Googling, came back with a couple answers:

- dead PSU; would explain the shut downs, also there's a loud whining noise when I turn it on and after I turn it off until it drains itself and the mobo LED goes out
- faulty power switch; would explain why it starts up on its own accord

This is the first time this build has been powered up (the answers above are typically from people who've been on working computers experiencing the same thing). The faulty power switch is interesting as it's a brand new case, so I don't know the plausability of it arriving stuck.

It's not the CPU overheating unless the heatsink I put on that's secure is complete garbage. I've had the issue before with a loose heatsink and I could get to the desktop before it conked out.

Any help would be awesome. Thanks.
post #2 of 13
Check your power button isn't jammed or shorted.(You can replace that with a cheap contact switch for a temp solution)
But It's not sounding good for your PSU.

Also just double check you have connected everything right.

Edit: The sound your PSU is making could just be the caps discharging.
Edited by Doom - 2/20/11 at 4:15pm
Aces and Eights
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post #3 of 13
Thread Starter 
Yeap, false alarm.

Just took the front apart, power button must've just been jaaaammmed in there somehow. All working now, and the whine is gone too.

Thanks!
post #4 of 13
Good news
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post #5 of 13
Thread Starter 
Hopefully you're still kickin' around Doom.

Just walked into the room with the computer, it's been shut down for a while, and the thing is still squealing. Pretty sure it's the PSU, but it's close quarters so I can't tell. Again, it goes away once the power is shut off and it gets some time to suck all the juice out.

Ideas? Should the caps be discharging for like an hour?
post #6 of 13
I've had a few PSU squealing issue before. Some graphics cards or bad connections can cause that, but more often, it is due to a bad PSU.

Not sure if it will help us troubleshoot it, but what components are you using?
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post #7 of 13
Do this, remove the PSU . Then jump it with a paper clip and plug it in and see what results you get. Then you will know if it's the PSU or not.
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post #8 of 13
is your video card securely fit?(screwed in the case bracket?) I would start the process of elimination...remove everything from the PSU except the mobo (+4pin/8pin 12v atx)...on/off....connect video card...on/off...connect hd...on/off
every step make sure the connections are secure > I had this problem coz I was making a DIY HD attachment to the case coz it didnt have a hd rack so I was guessing my cables were getting in the way of maybe the other psu cables...
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pscott
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post #9 of 13
Thread Starter 
@DaveG: Components...

Asus P5G41T-M/CSM mobo
G.Skill Ripjaws 1333MHz RAM 4GB (2x2GB; currently only 2GB in)
Gigabyte GT 430
Asus Xonar DX
Corsair CX430
Intel E6500
SilenX 80mm heatsink
Samsung S203B DVD drive
Western Digital 500GB hard drive (a few years old, but reliable)
nMediaPC HTPC 8000 case

@fonzy: How would I jump the PSU?

@pohtangina: Yes, everything is securely fit, or at least I do believe so. How would the cables getting in the way affect it? Would it cause a short or what?
post #10 of 13
you can jump the psu with using a paper clip and put one ends on the green and black wire...guide

some cables can push other cables loose...its just a possibility
pscott
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Antec 500w APevia 
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pscott
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CPUMotherboardGraphicsRAM
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Hard DriveOptical DriveOSMonitor
160+250 sata +80ide LiteonDL+SonyDRU800a Win7/vbox.Ubuntu/vbox.XP'sp3' Dell17"+Samsung17" 
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