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ApochPiQ · 9th September 2006, 02:53 PM

It sounds like you may have a faulty power supply; the symptoms are certainly consistent with that. What is the wattage rating on the power supply (should be listed on the casing some place) and what are the specs of your PC?

4electros · 9th September 2006, 06:48 PM

Quote:

Originally Posted by ApochPiQ

It sounds like you may have a faulty power supply; the symptoms are certainly consistent with that. What is the wattage rating on the power supply (should be listed on the casing some place) and what are the specs of your PC?

Would that be helpful?! what about the specs of the pc , as it may clear the fault is from the power supply itself.

could you clarify your viewpoint more please?
thanks

justDIY · 9th September 2006, 06:51 PM

I still think there is some measurement problem ... the PC would not operate, it would not turn on at all, with 0 volts on the 12v and 3v rails and only 2 volts on the 5v rail, it's just not possible.

ApochPiQ · 9th September 2006, 07:36 PM

It's possible the PSU isn't entirely at fault; if you have too much load on the PSU from the computer itself you can get all kinds of horribly unpredictable results, including freezes, rebooting, random software crashes, etc. etc. Knowing the rated wattage of your PSU and the components you are trying to run on that supply will help ascertain if the problem is power-related.

I agree there's a measurement problem involved, but it's still thoroughly possible for the supply to be providing inconsistent or insufficient power, if it is overloaded/failing. Abnormally low voltages on auxiliary rails are not uncommon in these cases. Also remember that many components will have a few V worth of tolerance in either direction, so it may not cause visible issues unless, say, the hard drive and CD are both active, or whatever.

4electros · 10th September 2006, 02:11 AM

I tried to measure another PC supply voltages and got:
12.92v for yellow
5.14 v for red
3.18 v for orange
------------------
But i'm afraid that I've done previous results while connecting power supply to mainboard but without pressing on the power switch itlself(which boots the PC) :S
so i'll try that again and come back here

4electros · 10th September 2006, 02:20 AM

Quote:

Originally Posted by ApochPiQ

It's possible the PSU isn't entirely at fault; if you have too much load on the PSU from the computer itself you can get all kinds of horribly unpredictable results, including freezes, rebooting, random software crashes, etc. etc. Knowing the rated wattage of your PSU and the components you are trying to run on that supply will help ascertain if the problem is power-related.

hmm....anyway do you mean by "rated wattage" of the psu those current and voltage ratings which is written on the psu itself?!
and what about those of the components also?

so finally when I get to know ,in which way should I make a benifit from that and deduct that the problem is just power-related?!

I'm asking much,Am i

justDIY · 10th September 2006, 03:57 AM

psu rated in watts, old ones 200, 250 maybe 300, new ones 400, 450, 500, gaming systems 650, 700, 1000 ... depending on the parts you are trying to assemble, you may have out-stripped the capacity of the supply.

generally a pentium 1 system should have no problems with a 200 w psu... I have seen them built all the way down to 150 watts... but if you have 8 hard drives connected to the old system, you'll need more power.

in other words, list out all the pieces you're trying to make work together, as well as the wattage rating printed on your PSU label.

4electros · 10th September 2006, 01:58 PM

Quote:

Originally Posted by justDIY

in other words, list out all the pieces you're trying to make work together, as well as the wattage rating printed on your PSU label.

There is only hard drive in work..no pieces are working together.
Anyway i've tried th re-measure the voltage ratings ,so the result is:

12.23v (yellow)
5.04v (red)
3.44 (orange)

Concerning the rating wattage,there are many writtings:
230,250w.........

but the 230 one was marked by true, so 230w is detected.

Also: 100w Max

justDIY · 10th September 2006, 03:10 PM

ok, it sounds like your supply is OK, and those voltages look good. The 100w max is probably for the 5v + 12v rail.

As I understand it, the old ATX spec dedicated roughly half of the total power to the "accessory" rail, and the 3.3v rail ran everything else.

The new ATX+12v and ATX+EPS specs now dedicate 75% or more of the total power to the 12v rail, thanks to the huge increases in power consumption of the CPU and Video cards. They now have their own power supply built onto the motherboard / card, which takes the 12v and steps it down to 1.1 to 1.8 volts, ramping the current way up.

Anyway, I don't think your PSU is suspect. You'll want to move onto more testing using a "live cd". Test your ram with memtest86, test your processor with "prime" or "super pi".

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9th September 2006, 02:53 PM	(permalink)
ApochPiQ	It sounds like you may have a faulty power supply; the symptoms are certainly consistent with that. What is the wattage rating on the power supply (should be listed on the casing some place) and what are the specs of your PC?

9th September 2006, 06:51 PM	(permalink)
justDIY	I still think there is some measurement problem ... the PC would not operate, it would not turn on at all, with 0 volts on the 12v and 3v rails and only 2 volts on the 5v rail, it's just not possible. __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

9th September 2006, 07:36 PM	(permalink)
ApochPiQ	It's possible the PSU isn't entirely at fault; if you have too much load on the PSU from the computer itself you can get all kinds of horribly unpredictable results, including freezes, rebooting, random software crashes, etc. etc. Knowing the rated wattage of your PSU and the components you are trying to run on that supply will help ascertain if the problem is power-related. I agree there's a measurement problem involved, but it's still thoroughly possible for the supply to be providing inconsistent or insufficient power, if it is overloaded/failing. Abnormally low voltages on auxiliary rails are not uncommon in these cases. Also remember that many components will have a few V worth of tolerance in either direction, so it may not cause visible issues unless, say, the hard drive and CD are both active, or whatever.

10th September 2006, 02:11 AM	(permalink)
4electros	I tried to measure another PC supply voltages and got: 12.92v for yellow 5.14 v for red 3.18 v for orange ------------------ But i'm afraid that I've done previous results while connecting power supply to mainboard but without pressing on the power switch itlself(which boots the PC) :S so i'll try that again and come back here __________________ Tourism in syria website: http:///www.syriatourism.org

10th September 2006, 03:57 AM	(permalink)
justDIY	psu rated in watts, old ones 200, 250 maybe 300, new ones 400, 450, 500, gaming systems 650, 700, 1000 ... depending on the parts you are trying to assemble, you may have out-stripped the capacity of the supply. generally a pentium 1 system should have no problems with a 200 w psu... I have seen them built all the way down to 150 watts... but if you have 8 hard drives connected to the old system, you'll need more power. in other words, list out all the pieces you're trying to make work together, as well as the wattage rating printed on your PSU label. __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

10th September 2006, 03:10 PM	(permalink)
justDIY	ok, it sounds like your supply is OK, and those voltages look good. The 100w max is probably for the 5v + 12v rail. As I understand it, the old ATX spec dedicated roughly half of the total power to the "accessory" rail, and the 3.3v rail ran everything else. The new ATX+12v and ATX+EPS specs now dedicate 75% or more of the total power to the 12v rail, thanks to the huge increases in power consumption of the CPU and Video cards. They now have their own power supply built onto the motherboard / card, which takes the 12v and steps it down to 1.1 to 1.8 volts, ramping the current way up. Anyway, I don't think your PSU is suspect. You'll want to move onto more testing using a "live cd". Test your ram with memtest86, test your processor with "prime" or "super pi". __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0