jony265

well i just picked up a new case w/ power & mobo (ecs elitegroup P4S5A mainboard & atx 350w power) i checked voltage on rear of pwr supply and installed all h/ware, ram, hdd, cdrom, etc... i set up bios to my preferences. next i set to boot from cd then put xp cd in and rebooted started os installation. got to point where you press f8 to accept microsoft agreement then it began process of copying files all of a sudden computer fan ALL JUST QUITS! well next i troubleshoot for 1 hr or so til i take pwr supply out and test on other box and no good. wow brand new pwr supply junk? next i run to local computer store and get raped on new 300w pwr sup for 48$, but i wanted it now. anyway came back installed and nothing. no power! i have been testing and troubleshooting all day and no luck. i replaced these parts which I KNOW worked 1 by 1-hdd,cd-rom,ram,power supply,video card,power cord,hdd cables. i am running pent 4 1.5ghz processor. my question is what else can it be? cannot be mobo can it? its brand new. can you burn mobo up from something being hooked up backwards? i mean my first couple computers i learned usually when you hook something up backwards it just doesnt work it doesnt burn up. can you burn up pwr supply same way? i am very sick about this as i am not rich and i would really appreciate any help anyone could offer. thank-you very much for helping

uf4

okay so you had built a pc b4(i mean b4 this one) and its worked just fine right?

- the 1st pwr supply may be gone since you have tested.. "i take pwr supply out and test on other box and no good"
- the 2nd pwr supply("300w pwr sup for 48$").. have you ever test it yet?
- check again.. when you mount mobo onto the case make sure there's no part of mobo(back side)in contact with the case.. remove all unnecessary or exceeding screws(fastener type) or metal plug in(metal stand) and also check whether you use correct type for mobo mounting.

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jony265

yes this is 3rd time building computer and first time w/ big problem. ok the mobo came pre-mounted and wired in the case but since i have run into this i took it out cause i read somewhere that board could be grounded on case(which is what i believe your suggesting) and it is all clear. i have tested both power supplys on the machine im on now and the first on dont work(fan doesnt start) and second starts up fine when testing. the only thing the mobo is in contact w/ is the brass inserts that hold the mobo to the case. are there failsafes built into mobo incase something hooked up wrong that it wont burn up? is 300w power supply sufficent to run pent 4 1.5ghz? i just cannot see why i cannot get that power supply & fan to start up when i know all parts involved work cause i keep retesting them as i go. if somehow i burned chip(on mobo) will that result in the power supply not starting? please all suggestions welcome!!! i dont have enough resources here to have stuff for 3rd computer therefore i cannot test this mobo unless i take this computer apart also(dont want to do cause then ill be alltogether down...) help help...and thanx to uf4 so far

uf4

okay so all wireing & cabling things shud be okay then..

well some mobo like "transcend" on some models got this prob. you need to put a spacer(paper type) on to screws that you use for mounting, other than that nothing from me atm. good luck.

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jony265

ok so you mean like some type of gasket material between the mobo and the brass inserts that it attaches to? btw i really apprec the help and attempt as i have posted this on several supposed tech friendly(knowlegable people) boards and you were only one brave or intelligent enough to take a stab at this perplexing problem so...thanx

Sourcer_2002

ok the standoffs while noe cause the the board to short out what u need to do is take you powersupply out that u cant get to start and plug it in and find the green wire that runs into the clip that plugs into the mobo and take a paper clip or a small wire and take one end and put it in the green hole and take the other and stick in one of the black ones it dosent matter and then make sure the switch in the back is flicked to on the fan should spin. more info herehttp://www.hardwaresite.net/case5.html

uf4

well i guess its can be anything since you got its in working condition at the 1st time.. may be that's why?
i dont know for sure really.. just trying & guessing thats all
okay if the mobo got a green(or any) LED but its not lit up..
it may be because that the chassis conducts the motherboard short..
so you will need to apply some insulated shims between the pillars and the motherboard.
some mobos is easily affected by this factor because of its layout design.
note gasket.. it is.

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jony265

when you say green wire into clip do you mean the 20prong main wire that goes into mobo from pwr supply. will this just start the fan or will this jumpstart the pwr supply? thanx for help and info.


ok nevermind the question i just went to the website and figured it out!!! has anyone EVER heard of a mobo takin a dump after 5min of runnin then the pwr supply goes bad??? is this possible??? its only 5min old?/? help answer please, thanx

reno

Try plugging a simple electrical device into the wall socket, if the computer shut off instantaneously, for no reason at all, and it's happened with two or more powersupplies, that is probably it. A blown wall socket.

jony265

not sure but i think i may have found something. i read here http://www.anandtech.com/guides/viewfaq.html?i=82 that my voodoo 3dfx 16meg video card may have damaged the mobo cause its 3.3volt instead of 1.5. problem is my mobo book doesnt say it requires 1.5v card and the 3dfx card fit fine in the only agp slot. i am running the 845 intel chipset and i now findout that they cannot play nice together. can anyone shed some light on this for me? anyone ever use a similar combination? mobo is P4S5A mainboard from ECS Elitegroup and has socket-478 fsb up to 400mhz all the specs say about agp slot is it has one 4X AGP slot.
THANK!

uf4

jony i dont think you hve to worry about that.. looking for something else

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Alan Allen

After reading all the posts concerning this, I believe your problem is that your M/B is not properly grounded to the case.

Every M/B MUST BE GROUNDED to the case. That is the purpose of one metal (usually brass) post that you screw one of the metal screws into. This screw must be in a hole on the M/B that is surrounded by silver metal which is a ground.

I would say that since you have removed all grounds is why the thing will not work. You most likely had it "accidentally" grounded when you first powered it up and that's why it initially worked for a short time. "Accidentally" meaning something else on the M/B was touching the case giving you the needed ground at first. Then this shifted and that's when you lost your power. (You may have also damaged your M/B at that point with this inconstant ground).

Hope this helps.

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[COLOR=lightblue] [SIZE=small]Alan Edward Allen[/COLOR] [/SIZE]
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