Why does my PC start up when I hang up the phone?

  • Thread starter Thread starter Michael Horton
  • Start date Start date
M

Michael Horton

Hi,

I have recently got one of those dual plugs for the phone
connection. Now I can leave the cable from the PC into
the phone as well as having the phone plugged in. What
I've noticed though is if I use the phone and hang up it
starts my PC..(ie: it just fires itself up). what's going
on & how do I stop it from starting my PC.

Any help would be gratefully acceted.
Michael
 
Hi,

I have recently got one of those dual plugs for the phone
connection. Now I can leave the cable from the PC into
the phone as well as having the phone plugged in. What
I've noticed though is if I use the phone and hang up it
starts my PC..(ie: it just fires itself up). what's going
on & how do I stop it from starting my PC.

Any help would be gratefully acceted.
Michael
Click to expand...

Your BIOS is probabley set to wake up the PC when there is any activity on
the COM ports. Check your BIOS
 
That BIOS change is probably not the solution; only cures a
symptom. There should be no voltage difference when phone
hangs up. The Modem was detecting a voltage difference and
turning on computer. Why is there a voltage difference
between phone line and maybe electrical ground?

Suggested: a grounding problem exists either on AC electric
or telephone line. If problem exists on AC electric earth
ground, then you have a potential human safety problem. If
ground problem is phone line, then you have other potentially
destructive problems.

Breaker box must now make a connection to earth ground rod
nearby the breaker box - as required by post 1990 National
Electrical Code. Your incoming phone line - the premise
interface box or NID - must also connect to same breaker box
earth ground. They both must share same earth ground. Only
visual inspection is sufficient to verify both earthing
connections exist.

That computer 'power up' may have been a warning about a
serious human safety problem; detecting a voltage difference
that should not exist. Rather than turn off the 'power-up on
ring' setting on BIOS, instead, find out why that
unacceptable voltage spike exists - and was detected by modem
and BIOS.
 
Thanks for that. I'll get Telstra out to check the phone
and an electrician for the power. I hate electricity!
 
Telstra? I don't believe Australia uses same premise
interface protection. Earthing as described is standard in
North America. But Australian often don't have anything
equivalent.

Irregardless, computer should not have been affected by a
simple phone disconnect. Voltage to be detected as a ring
voltage by computer means something is not right.

You don't need an electrician to verify the breaker box is
earthed. Ground connection should be visually obvious. A
single and heavy copper wire from breaker box to either an
earth ground rod outside or maybe to cold water pipe. Should
an electrician be called, then have him show you this earth
ground. The only way you will ever know that you (and not
anyone else) must get a ground fixed is to know what to look
for. Only visual inspection can determine when professional
help is required for a grounding problem.
 
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