Is something getting shorted here?

G

Guest

Guest
Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

I've built a PC out of working parts. Sometimes it boots, but most of the
time it doesn't.

I've tried chaning a lot of things, such as chaning around the RAM, removing
everything except video & 1 DIMM (I have 3), changing the BIOS battery,
removing screws that hold the motherboard onto the case, and fiddling around
with all those switch & LED connections.

There isn't one single thing I can find wrong with it. I got it to boot 3
or 4 times in a row, which was pretty good, but I don't think I did anything
more than push in the ATX plug a little harder. The heatsink is getting in
the way, just a little, it causes one side of the plug to be raised up about
0.5-1.0mm from flush.

I removed and rescrewed in 2 of the screws on the motherboard, and it did
boot once, but then not again, so I'm not sure if something is getting
shorted here or not.

When it was able to boot up properly, I found that the CPU was at 27C, and
the case was at 21C. It is an Athlon 900, with 320MB RAM (128/128/64), ATI
Radeon 7000, 300W PSU that's worked for ~3 years without problems, Abit
KT7-RAID, cheap CompUSA case.

For what it's worth, I added a 15 ohm resistor to the +12V line on the fan
in the PSU. The fan starts reliably and seems to be blowing a fair amount
of air. There is no grill on it, other than the 3 plastic bars built into
the fan itself, so it shouldn't have any resistance blowing air out. It was
originally a 33CFM fan, 0.19A. It should be receiving 9.15V instead of 12V,
if I understand the electronics right....
 
G

Guest

Guest
Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

Anonymous Joe wrote:

> I've built a PC out of working parts. Sometimes it boots, but most of the
> time it doesn't.
>
> I've tried chaning a lot of things, such as chaning around the RAM, removing
> everything except video & 1 DIMM (I have 3), changing the BIOS battery,
> removing screws that hold the motherboard onto the case, and fiddling around
> with all those switch & LED connections.
>
> There isn't one single thing I can find wrong with it. I got it to boot 3
> or 4 times in a row, which was pretty good, but I don't think I did anything
> more than push in the ATX plug a little harder. The heatsink is getting in
> the way, just a little, it causes one side of the plug to be raised up about
> 0.5-1.0mm from flush.
>
> I removed and rescrewed in 2 of the screws on the motherboard, and it did
> boot once, but then not again, so I'm not sure if something is getting
> shorted here or not.

Certainly sounds like a strong possibility. Why not take the board out
of the case and try it on the bench?

> When it was able to boot up properly, I found that the CPU was at 27C, and
> the case was at 21C. It is an Athlon 900, with 320MB RAM (128/128/64), ATI
> Radeon 7000, 300W PSU that's worked for ~3 years without problems, Abit
> KT7-RAID, cheap CompUSA case.
>
> For what it's worth, I added a 15 ohm resistor to the +12V line on the fan
> in the PSU. The fan starts reliably and seems to be blowing a fair amount
> of air. There is no grill on it, other than the 3 plastic bars built into
> the fan itself, so it shouldn't have any resistance blowing air out. It was
> originally a 33CFM fan, 0.19A. It should be receiving 9.15V instead of 12V,
> if I understand the electronics right....
>
>
>
>
 
G

Guest

Guest
Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

"Triffid" <triffid@nebula.net> wrote in message
news:BiElc.31414$ZJ5.792317@news20.bellglobal.com...
>
>
> Anonymous Joe wrote:
>
> > I've built a PC out of working parts. Sometimes it boots, but most of
the
> > time it doesn't.
> >
> > I've tried chaning a lot of things, such as chaning around the RAM,
removing
> > everything except video & 1 DIMM (I have 3), changing the BIOS battery,
> > removing screws that hold the motherboard onto the case, and fiddling
around
> > with all those switch & LED connections.
> >
> > There isn't one single thing I can find wrong with it. I got it to boot
3
> > or 4 times in a row, which was pretty good, but I don't think I did
anything
> > more than push in the ATX plug a little harder. The heatsink is getting
in
> > the way, just a little, it causes one side of the plug to be raised up
about
> > 0.5-1.0mm from flush.
> >
> > I removed and rescrewed in 2 of the screws on the motherboard, and it
did
> > boot once, but then not again, so I'm not sure if something is getting
> > shorted here or not.
>
> Certainly sounds like a strong possibility. Why not take the board out
> of the case and try it on the bench?
>
> > When it was able to boot up properly, I found that the CPU was at 27C,
and
> > the case was at 21C. It is an Athlon 900, with 320MB RAM (128/128/64),
ATI
> > Radeon 7000, 300W PSU that's worked for ~3 years without problems, Abit
> > KT7-RAID, cheap CompUSA case.
> >
> > For what it's worth, I added a 15 ohm resistor to the +12V line on the
fan
> > in the PSU. The fan starts reliably and seems to be blowing a fair
amount
> > of air. There is no grill on it, other than the 3 plastic bars built
into
> > the fan itself, so it shouldn't have any resistance blowing air out. It
was
> > originally a 33CFM fan, 0.19A. It should be receiving 9.15V instead of
12V,
> > if I understand the electronics right....

I will try that....it's just rather hard to line up the holes because of the
case :(
 
G

Guest

Guest
Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

"Anonymous Joe" <anonymousjoe@net.net> wrote:

>> > For what it's worth, I added a 15 ohm resistor to the +12V line on the
>fan
>> > in the PSU. The fan starts reliably and seems to be blowing a fair
>amount
>> > of air. There is no grill on it, other than the 3 plastic bars built
>into
>> > the fan itself, so it shouldn't have any resistance blowing air out. It
>was
>> > originally a 33CFM fan, 0.19A. It should be receiving 9.15V instead of
>12V,
>> > if I understand the electronics right....
>
>I will try that....it's just rather hard to line up the holes because of the
>case :(

Can't any of you clueless Outhouse Express users figure out how to
configure a newsreader so it doesn't mangle quotes?
 
G

Guest

Guest
Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

In article <pqnh90pppoe0u7d40pv8eecodlj006dvbj@4ax.com>,
chrisv@nospam.invalid says...
> "Anonymous Joe" <anonymousjoe@net.net> wrote:
>
> >> > For what it's worth, I added a 15 ohm resistor to the +12V line on the
> >fan
> >> > in the PSU. The fan starts reliably and seems to be blowing a fair
> >amount
> >> > of air. There is no grill on it, other than the 3 plastic bars built
> >into
> >> > the fan itself, so it shouldn't have any resistance blowing air out. It
> >was
> >> > originally a 33CFM fan, 0.19A. It should be receiving 9.15V instead of
> >12V,
> >> > if I understand the electronics right....
> >
> >I will try that....it's just rather hard to line up the holes because of the
> >case :(
>
> Can't any of you clueless Outhouse Express users figure out how to
> configure a newsreader so it doesn't mangle quotes?

Well, does it answer your question by stating the obvious? They
*are* using OE. ;-)

--
Keith
 
G

Guest

Guest
Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

chrisv <chrisv@nospam.invalid> wrote in message news:<pqnh90pppoe0u7d40pv8eecodlj006dvbj@4ax.com>...
> "Anonymous Joe" <anonymousjoe@net.net> wrote:
>
> >> > For what it's worth, I added a 15 ohm resistor to the +12V line on the
> fan
> >> > in the PSU. The fan starts reliably and seems to be blowing a fair
> amount
> >> > of air. There is no grill on it, other than the 3 plastic bars built
> into
> >> > the fan itself, so it shouldn't have any resistance blowing air out. It
> was
> >> > originally a 33CFM fan, 0.19A. It should be receiving 9.15V instead of
> 12V,
> >> > if I understand the electronics right....
> >
> >I will try that....it's just rather hard to line up the holes because of the
> >case :(
>
> Can't any of you clueless Outhouse Express users figure out how to
> configure a newsreader so it doesn't mangle quotes?

Is that the biggest problem you could find to whine about today?
Maybe he got abused by "advanced" users for top-posting during
childhood, and now everything goes on the bottom. Or maybe, just
maybe, he thought your ISP would let you see the entire thread so you
could follow along with the group. What a way to discourage posts you
OE-phobic, holier-than-thou ASS.