Prob with slot1 mobo

Anyone come accross a PC that fails to post and when you turn the psu on with its switch its fans start wirring but that is all? IE, the PSU fan starts going without anything else happening and neither the reset switch nor the start switch produce any effect after this. I've tried with 3 PSU's now and the first 2 just didnt do anything but the third has this weird fan thing going on. Strange because the mobo was fine and all I did was take it out of old case, put it on antistatic bag for a few days and then put it in a diff case. Still useing same cpu, ram etc...

if its an ATX power supply it could indicate there is a hardware problem with your system and thus will not power up due to,a sort of,inbuilt safety feature.
Recheck the motherboard is not touching the case anywhere i.e around the mountings and that you have the power leads connected correctly.
BTW You didnt power the PSUs up without connecting to the motherboard did you?

</font><blockquote><font size="1" face="Trebuchet MS, Verdana, Arial, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Trebuchet MS, Verdana, Arial, Helvetica, sans-serif">Originally posted by vapd:
<strong>Anyone come accross a PC that fails to post and when you turn the psu on with its switch its fans start wirring but that is all? IE, the PSU fan starts going without anything else happening and neither the reset switch nor the start switch produce any effect after this. I've tried with 3 PSU's now and the first 2 just didnt do anything but the third has this weird fan thing going on. Strange because the mobo was fine and all I did was take it out of old case, put it on antistatic bag for a few days and then put it in a diff case. Still useing same cpu, ram etc...</strong></font><hr /></blockquote><font size="2" face="Trebuchet MS, Verdana, Arial, Helvetica, sans-serif">several things to check:

1: motherboard not shorting on casing , remove PSU and m/board and vid card , stand on static mat with a "yellow pages" (with vid card overhanging)and try again. remove the speaker from case and listen for noises from it

2: psu in new case faulty.

3: ide/floppy cable on backwards

4: badly seated cpu/ram

5: cmos reset jumper set to clear

6: h/drive /floppy /cd-rom shorted out (screws to long

7: check that the cpu fan is connected to the cpu outlet on m/board (some boards will not start if it does not "see" a fan

do as in No, 1 and try a different psu ,,
also try clearing bios AND PUTTING THE JUMPER IN THE CORRECT POSITION. use a screwdriver (or a spare switch) to trigger the board

if with a "new" psu in and a basic setup (no extras) it does not start then i would substitute the cpu

on certain m/boards you can "trigger" them by pressing the "insert" key repeatedly

freddy

I had the exact same thing happen on an EPOX 8kha+, I changed the psu and the ram and the processor and even then it would not work, it would just post that the memory was bad, tried 3 different sticks with no results. Ended up sending the board back and getting another with the same problem. I have a feeling that it was the board because after that I put all the other componants in another machine and they worked fine. So I am interested in the outcome of this one.

Hey guys, I have had the same problem when I swaped my inards to a new case, for some reason the only way I could cure it was to remove my CMOS Battery and disconect from the mains for 5 mins. I then put the bat back in and hey presto, my machine fired up (minus the correct bios settings, but hey that was a 2 min job to put rite). I hope this is useful to you.

Thanks for advice, I've put togeather a few PC's over the years and never had a short so its very good to know that this may be the cause of my probs. Anyway, many thanks for the advie I will see what happens when I have time to play with it again.
Cheers
Andre
Actually I have another q, can any of you advise me on how to test a poss faulty ATX psu? I have a good quality multimeter and fear that a certain psu might have blown a mobo, so obviously I am loathed to try it in another machine. But I have no idea of how to use my meter <img border="0" title="" alt="[Frown]" src="frown.gif" />

</font><blockquote><font size="1" face="Trebuchet MS, Verdana, Arial, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Trebuchet MS, Verdana, Arial, Helvetica, sans-serif">Originally posted by vapd:
<strong> Actually I have another q, can any of you advise me on how to test a poss faulty ATX psu? I have a good quality multimeter and fear that a certain psu might have blown a mobo, so obviously I am loathed to try it in another machine. But I have no idea of how to use my meter :(</strong></font><hr /></blockquote><font size="2" face="Trebuchet MS, Verdana, Arial, Helvetica, sans-serif">Actually, bad PSU could destroy some of ICs on the motherboard...
For checking suspected PSU I would recommend to test it separately from motherboard.

Short "power-on" signal wire with any of "ground" wires of the PSU (any of ASUS motherboard's manual does have power connector pinouts description,by the way).
PSU have to start. Disconnecting that "power-on" signal from "ground" - power OFF. Check all the voltages - one of multimeter's probes (black) should be connected to the "ground" (or PSU's case) - another one (red) - to the pin beeing tested. Be carefull! <img border="0" title="" alt="[Wink]" src="wink.gif" />

Hi Ruslan,
thanks again, you have helped me a number of times and I am in debt to you!! As a note I now have a 32 pin zif for bios flashing, a soldering iron and an asus mobo I can hot swap on. Its all because of your postings on windrivers and I have at least one mobo that can be fixed with this setup.

Thanks again
Andre

yep, it was a case short, I realised this was likly when I looked at previous case and saw I had put spacers in places where they shouldnt go on a non scktA board. oooppps. will try to be more thorough b4 I post with silly q again :rolleyes: