when I plug my modem in, my system powers down

  • Thread starter Thread starter JAD
  • Start date Start date
J

JAD

modems are one of the few things that are not 'hot swap' ...at least
many aren't.

The modem should be plugged in before the machine boots. Especially
when DHCP is enabled

That being said, that part isn't causing a reboot.

Power supply is failing..and the extra pull from the modem is killing
the PSU. Modem is powered externally?

or maybe you need to 'reset configuration data' in the bios as an IRQ
conflict is causing the reboot. again reset, then boot with the modem
plugged in.

It could be co inky dink and something entirely different is causing
it. heat, vid card not seated...USB drivers for the first board are
still loaded as you just swapped the MB without cleaning up the
original windows Intel.... any beeps?
 
Gary Grainger said:
I've just swapped my mini form board and 900 mhz duron cpu for a full
size board (AS Rock) and a 2.6Mhz CPU. We had to use a socket doubler
for one of the power leads. Now, when i have the computer running and I
plug in my broadband modem to the usb port, the machine powers off. if I
start the machine up woith the modem plugged in, it powers off halfway
through the startup process. I'm guessing that this is to do with the
amount of power I am trying to get from my psu ( a 300watt Universal)? I
jhave 2 hard drives and 2 optical drives connected too, as well as a
graphics card and a floppy.
Should I just get a new psu - will this fix the problem? And if so,
which one should I get?
Oh, and I don't have a case fan, though the graphics card has a fan of
its own
cheers
Gary
Click to expand...
If you are running XP go into device manager and look at your Usb hubs,
there is a power tab which shows power drawn. USB spec is 500mA, my Sagem
ADSL modem draws 400mA, but many drawer 550mA or more and some motherboards
(VIA chipsets for one) will cut out if asked to supply more than 500. One
quick fix is to use a powered USB hub and let that supply the power.
Mike.
 
Your "inexpensive" 300 watt power supply unit is undoubtedly putting out
nowhere near 300 watts at the computer's operating temperature into a real
world load. And you don not have a case fan. Bad.
I would seriously suggest that you consider getting an Antec case with an
Antec True Power power supply unit. I believe that will solve your
problems.
 
I've just swapped my mini form board and 900 mhz duron cpu for a full
size board (AS Rock) and a 2.6Mhz CPU. We had to use a socket doubler
for one of the power leads. Now, when i have the computer running and I
plug in my broadband modem to the usb port, the machine powers off. if I
start the machine up woith the modem plugged in, it powers off halfway
through the startup process. I'm guessing that this is to do with the
amount of power I am trying to get from my psu ( a 300watt Universal)? I
jhave 2 hard drives and 2 optical drives connected too, as well as a
graphics card and a floppy.
Should I just get a new psu - will this fix the problem? And if so,
which one should I get?
Oh, and I don't have a case fan, though the graphics card has a fan of
its own
cheers
Gary
 
JAD said:
modems are one of the few things that are not 'hot swap' ...at least
many aren't.

The modem should be plugged in before the machine boots. Especially
when DHCP is enabled

That being said, that part isn't causing a reboot.

Power supply is failing..and the extra pull from the modem is killing
the PSU. Modem is powered externally?

or maybe you need to 'reset configuration data' in the bios as an IRQ
conflict is causing the reboot. again reset, then boot with the modem
plugged in.

It could be co inky dink and something entirely different is causing
it. heat, vid card not seated...USB drivers for the first board are
still loaded as you just swapped the MB without cleaning up the
original windows Intel.... any beeps?




and I


if I


Universal)? I
Click to expand...
This is great, and I understand some of it too! But how do i clear \out
all of my old drivers? (The first question of many!)
cheers
G
 
DaveW said:
Your "inexpensive" 300 watt power supply unit is undoubtedly putting out
nowhere near 300 watts at the computer's operating temperature into a real
world load. And you don not have a case fan. Bad.
I would seriously suggest that you consider getting an Antec case with an
Antec True Power power supply unit. I believe that will solve your
problems.
Click to expand...
Many thanks for this - it is the same conclusion that i was heading
towards. Oh well, off to ebuyer then
cheers
Gary
 
Michael said:
If you are running XP go into device manager and look at your Usb hubs,
there is a power tab which shows power drawn. USB spec is 500mA, my Sagem
ADSL modem draws 400mA, but many drawer 550mA or more and some motherboards
(VIA chipsets for one) will cut out if asked to supply more than 500. One
quick fix is to use a powered USB hub and let that supply the power.
Mike.
Click to expand...
thanks a lot! I have a powered usb hub (as well as 2 unpowered), but
have been running my moodem from the onboard usb ports. I'll give this a try
cheers
Gary
 
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