Thread: PC shuts off immediately after starting

Immediately I power on my pc, the fans start up, leds all light up, then about 0.5 seconds afterward it powers right back off. Hitting the back switch off then back on lets me replicate the process for no cause. Is this a guaranteed PSU fail or is it probable it's something else?

1. Unplug PSU.
2. Find and eliminate the CMOS battery (looks like a coin).
3. Reset CMOS (jumpers or switch - counts on mobo).
4. Wait 24 hours.
5. Insert CMOS battery (eliminate jumper if wanted).
6. Plug in PSU and power on.

My board is giabyte's MA790XT-UD4P (am3) if that’s of any attention, I will also begin it up with 2 sticks of ram in place of all 4 in case of some abnormal glitch I’ve been known the honor of having.

Sounds precisely like the PSU over current defense kicking in. That doesn't assist much though as that could either be a bad PSU, bad component, or the whole computer is fried. Absolutely start with viper's proposition though. After that you might have to start taking out critical components and seeing if the board can ever yet acquire to the BIOS error beep codes. I think for Gigabyte you can just short two jumpers or wait an hour after eliminating the battery, but no harm in waiting too.

I had to remain 24 hours on one of my Gigabyte boards. I waited 3 hours to begin with and that wasn't long sufficient.

I overlooked to add this step but release the capacitors before you power it all back up.
1. With the PSU yet unplugged and the CMOS battery still out.
2. Hold the power button for 45 seconds to 1 minute.

I'm ostentatious it's the psu, its a thermaltake tough power 850w modular, my system only sucks 380 watts MAX (electronic energy meter in wall socket) and as I unspoken from reading up on a PSU appraisal once, that means it's running in a terribly inefficient state, particularly when I’m inactive at like 120 watts :S

If wanted, specs are as follows
Phenom II x4 3.2ghz (stock)
4870 with like 5% factory OC
4x 2gig ocz at 1.7 volts & timings slower than stock (7-7-7-24)
2x hdd
2x DVD rw
x-fi gamer sound card
network card
some cheesy eSATA card that sucks
fan controller
6x 120mm led
2x 80mm led
1x 90mm led
custom added 140mm in PSU, some super scythe fan, the circle ones, I had to replace the stock fan cause it completed annoying grinding sounds, plus this one blows more air with less sound.

It isn't unavoidably very incompetent at the low loads. I recognize my new PSU can hold about 80% yet at very low loads. Optimum competence does occur higher up though.

Could have been a surge. At this end, I believe you just have to start removing components and observe if you can ever get it to boot. Start with the basics, as in only CPU, GPU, one attach of ram, and all necessary fans.

I am having the similar type of problem with an Enermax PSU. I resolute that there is nothing wrong with my construct as I installed a different PSU and it work well. The PSU oddly sufficient works fine on another build.

I hope it attaches your trouble. I hope all of you reading this have learned a valuable lesson: you should have tons of computers (and thus spare parts) lying around your house like I do to create troubleshooting easier.