PC Shuts down by itself, sometimes freezes

Yeah, I should buy new PSU, 550 Watts more than this one has...

Yesterday, I've disconected PC from UPS, it worked 14 hours, no problems :s

So, you're saying PSU can weaken over time?

Also, my UPS is very noisy, some kind of a high-pitched noise. And when power goes off, PSU gets its power from the UPS. That's the moment when PSU becomes noisy, too. I can hear some crackling sounds coming from it...

What do you think about that?

PS Maybe I should replace UPS, too...

Thank you very much for your time, Bob!

Which PSU do you recomend?

What do you think about "LC Power"?

I'm not saying it weakens over time. Every electronics designer says that. Here's the component that is why -> The electrolytic capacitor loses capacity with time. Push it harder (such as more load on the PSU) and you accelerate the aging. If you want you can research this component of the PSU but let's move on.

Removing it from the UPS could give it a cleaner AC signal. Some UPS will not put out a true sine wave but it does not matter here. Your test is a good one and points to the usual aging issue.

I'm sticking with my advice of adding 100 more Watts to the PSU (you did me one better by adding 150.) And let me share my personal desktop has a PSU that is more than double what the higher Watts I see the desktop draw on the Watt Meter (yes I own a Watt Meter.)

It's like a car. Take your car and run it at 120 MPH and see how long it takes to break down versus 60 MPH. It would be quite short.

--> And my advice about cleaning stands. Most won't clean the vents much less the inside until the machine fails. My advice is a yearly (your birthday is a good reminder for this and fire alarm batteries) cleaning of at least the vents and dust out the insides. Spend 2 minutes a year and extend a machine's life by years.
Bob

I know dusty fans can make trouble. I clean those fans once in a year.

I've changed Graphic Card fan (became too noisy), so it's brand new.

But I haven't changed PCU's thermal paste. Maybe I should do that too.

Ok then, I'll buy new PSU

Also, I would be very thankful if you can tell me about that noise coming from UPS and PSU I've described in previous post.

PS I would like to use this UPS in the future, but ofcourse I'll throw it away if it can make some damage to my new PSU (when a guy from PC shop heard about that "UPS noise issue" he suggested UPS damaged PSU - that would be real irony, I've bought it to protect my PSU)...

*PCU's thermal paste - I thought CPU's... sry

I think you have a solid grasp on the issues of the usual problems.

I like installing fresh CPU thermal paste for many reasons. It lets me wipe off the old (I don't get every microgram off) apply new and be sure the heat sink is on proper. Also it gives me a chance to clean that item.

Bob

I don't know if you've read my message about noisy UPS...

(from previous post:

my UPS is very noisy, some kind of a high-pitched noise. And when power goes off, PSU gets its power from the UPS. That's the moment when PSU becomes noisy, too. I can hear some crackling sounds coming from it... I would like to use this UPS in the future, but ofcourse I'll throw it away if it can make some damage to my new PSU. When a guy from PC shop heard about "UPS noise issue" he suggested UPS damaged PSU - that would be real irony, I've bought it to protect my PSU).

Do you think I can keep using it (UPS) when I buy new PSU?

PS Sorry for bothering you this much, but it seems yours answers are very "logic and knowledge" based.

Noise from a PSU is a bad sign. All we want to hear is the fans. Anything else and we know the coils inside are trying to move (this is the only component in today's PSU that should be able to emit noise.)

The PSU noise beyond the fans is a bad sign and a sign for stress.

Upping the Watts should help. I can't tell what the UPS is but http://www.newegg.com/Product/Product.aspx?Item=N82E16817146604 you want a step-approximated sine wave or a real sine wave. Those old square wave units are rough on some supplies.

Hope this helps,
Bob

Thank you so much for your help and your time!

PS I'll feel free to post here if I have any problems in the future.

All the best!

Working on it already (Found decent 500W PSU)

Thanks.