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Computer will not boot up, suspected Power Supply.

Since late September, my computer has been malfunctioning by not booting up when I press the power button. While my computer is connected, in the off position, I hear a repeated clicking noise. Occasionally, when I let the connected PC sit overnight while generating enough power, I can use my system as long as I do not turn it off. I suspect this is an issue with the power supply, but I have no idea how to trouble shoot this. This is a machine that I built, the specs are as followed:

CPU- AMD Athlon 64 3500+
MoBo- MSI K8N Neo4 Platinum/SLI
RAM- 1 GB DDR
Graphics Card- ATI x800 XL
Power Supply- AeroPower - The black / silver line 550 W
HDD- WD 74 GB Raptor 10,000 RPM

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Power Supply

In reply to: Computer will not boot up, suspected Power Supply.

Check all your connections/cables first. Clicking noises are usually associated with a dying hard drive though. When PSU failure is intermittent like this, checking the voltages with a multimeter is pointless. So the next step would be to try a new PSU.

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..

In reply to: Power Supply

Thanks Darton, I inspected the clicking noise which seems to be coming from the Power Supply Unit itself, so I guess my best bet would be to replace the PSU.

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The clicking noise from a PS is likely the fan.

In reply to: ..

the fan is not hard to replace.

If the fan blade gets stopped intermittently the PS could overheat and shut itself down.

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Please explain your statement

In reply to: Computer will not boot up, suspected Power Supply.

" Occasionally, when I let the connected PC sit overnight while generating enough power," Is tyhe system on??? Why would it be generating more power???

"Connected in the off position". Assume that you mean the power supply is plugged into AC Power and into the mobo, but Windows has been shut down. The power Supply at this time is providing 5 volt standby power to the mobo. I don't know of any power supplies that have to run the fan in this mode, however it is possible that your supply has a temp sensor that turns the fan on when it gets too warm.

Sounds like a nice High Power supply, hate to have you throw it out if the problems is simply a sticky $6.00 fan.

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Explanation

In reply to: Please explain your statement

I cannot even start up the computer with pressing the button at this point. What i meant is that occasionally, after letting the power supply sit while my computer is off(while PSU is plugged into the wall) it emits a high pitched noise, and that is when i can power up my computer. Basically, when i put my head up to the computer, it is obvious that the clicking noise is coming from the PSU itself. However, I do not know whether or not the problem pertains to the PSU, motherboard, RAM, etc.

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How old are you or do you have

In reply to: Explanation

excellent ears?? The high pitched noise may well simply be the switching section of the power supply with a transformer that is singing. If so, the question would be why does it not sing all the time.

Again a clicking noise would be the fan. Simply replace it if the supply otherwise is good.

I think that you said that you were getting a PS tester.

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Not kidding about the ears. When I was a kid

In reply to: How old are you or do you have

so many years ago, I could heaar the high voltage oscillator in TV sets. It bothered the heck out of me. As my hearing deteriated I could no longer hear it. It was 15,500 Hz if I remember.

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Clicking noise

In reply to: Computer will not boot up, suspected Power Supply.

could be fan twitch (PS trying to start but shutting down) relay (but suspect most are solid state these days) or arcing capacitor (very bad news). About the only way to troubleshoot this is to apply minimum load to the PS such as disconnect everything you can and see if the PS fires up. You must leave some load in place or the PS will also refuse to start. You can pull the CPU from the board, remove other cards such as video but leave at least one hard drive connected. Turn it on and see if the PS fan starts and stays alive. Then reconnect everything one at a time and restart each time. If at some point the PC won't start, either the last device connected is generating an overload or the PS has dropped it's output capacity. If you still suspect the PS, you will have to try another one as verification. This will mean purchasing a PS and possibly having to incur a restocking fee if you need to return it.

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not psu. not cd/rw. not hd. not ram

In reply to: Clicking noise

clicking noise when power ON. disconnected: hard drive, cd-r, cd-w, floppy, multimedia readers, ram, network card. still have clicking noise. replaced power supply. still have clicking noise. (odd: without RAM, shouldn't there be SOS style beeping?). what's left? if its the mother board or if its the cpu, how would I know? hp a420n out of warranty. reply to j1076366@hotmail.com

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