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I think I have a bad Power supply Unit (PSU).

Computer specifications below.

Symptoms include:
Unpredictable instant uncommanded computer shut downs

Background:
I bought this computer system a year ago. After the first few months I noticed the computer shutting down every once in a while, no warning. As time passed these started happening more frequently. I haven't really thought anything of it until the last 3 months when I started thinking it's more serious. I don't thing its the new Windows 64 bit OS doing it anymore. I also noticed the computer started shutting down more frequently when intense programs where loaded (such as Flight simulators, the main job of this computer lol, other programs - games - like BF2).

Load a program now = instant shut down.

Just letting the computer run (Windows loaded) = maybee half an hour of web browsing, etc.

At present I can barely keep the computer on long enough to do anything.

Visual inspection of the PSU (Xion LC-B450E):
4* 1000 microfarad capacitors appear convexed at the top (bulging).
1 resister, looks like a 10 ohm R, Looks like it has been overheated. Colour bands are almoast unreadable. Will have to verify it's resistance after extraction, if it has any left, lol.

I have basic electronics knowlege and some experience in componant extraction and replacement.

I'm not all that experienced though so here's the question:

If indeed the problems are said componants, is it really that easy to epair a PSU? Why do they costs so much!?
A little reasurence would help, lol. I am out of money so I can only try this once. Advice would also help if there might be something I overlooked. I haven't been able to find a schematic for any PSUs so I will have to schetch my own after I open it up again. So I don't know where in the circuit those Cs and that R are.

Also, would it be possible to increase the output of the PSU or would I have to make too many changes inside? Not an electronics expert yet. I can't buy a new PSU either for a while so this has to last. I admit I overlooked the PSU when I bought this machine! I bought everything from the same shop so I was sort of expecting them to not under-power me. My mistake!

Thanks for any advice/help that can be provided.

Computer:
Xion LC-B450E Power supply unit (specs below)
MSI7125 1B0
AMD Athalon 64 3500+
2*1GB DDR400 RAM from Crucial
Radeon X700 256MB PCI-e

Some other things are irrelavent as I have to unplug them if I want the computer to run:

Hard drives, right now I have 2 plugged in.
2*500GB Seagate SATA II
1 400GB Hitachi SATA I (unplugged)
1 CD/RW drive
1 DVD ROM drive (unplugged)
1 1.44MB floppy (unplugged)
CPU fan Thermaltake
Blower Thermaltake fan
All other fans unplugged since it's winter (computer came with 3)

Temperatures:
We have no air conditioning so, during the summer the average CPU temperatures where 55ºC. Case temp was averaged around 40ºC. This is when I thought it was an overheating problem.

Winter temperatures now put the CPU average temperature to 38 to 40ºC. Case temperature same.

PSU
DC OUT:
+3.3V 28A 92.4W
+5V 50A 250W
+12V 18A 216W
-5V 0.8A -4W
-12V 1A -12W
5VSB 2.5A 12.5W
+5V +3.3V + 12V MAX COMBINED=422W

According to my calculations, if everthing there was maxed out, it would equal 566.9W
I also included the watts beside each amp (not included on PSU's label) using the fourmula Volts * Amps = Watts.
Do I see some inconsistancies just by reading the label? lol
 
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