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David B.
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 Posted: Fri Dec 21, 2007 1:59 pm Post subject: Re: Swapping laptop HDD's? |
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The hard drive will not cause the no power issue unless it's shorted, pull
it out and confirm that you still have the power on issues.
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Crosspost, do not multipost http://www.blakjak.demon.co.uk/mul_crss.htm
How to ask a question http://support.microsoft.com/kb/555375
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"Kenny" <me@privacy.net> wrote in message
news:O52vHW8QIHA.5288@TK2MSFTNGP04.phx.gbl...
| Quote: | It won't stay on long enough to run memory tests.
Reason I initially suspected HDD was a "PXE-61 Media Failure Test" at
boot.
This relates to not finding a bootable HDD or CD and trying to boot from a
network although the HDD was installed properly.
--
Kenny Cargill
"Mike Hall - MVP" <mikehall@mvps.com> wrote in message
news:eX8euJ3QIHA.280@TK2MSFTNGP03.phx.gbl...
"Kenny" <me@privacy.net> wrote in message
news:O5$JSb0QIHA.1184@TK2MSFTNGP04.phx.gbl...
Tried running it using a Knoppix CD and an Ultimate Boot Disk CD with
the HDD removed.
With both sometimes it wouldn't start at all and other times would boot
to the initial interface then PC would totally freeze after a fairly
short period of time, not long enough to run any memory diagnostics or
anything else.
It's the same on both battery and mains power.
There is no dust anywhere and the CPU fan turns easily by hand.
--
Kenny Cargill
"JohnO" <johno@!NOOSPAM!heathkit.com> wrote in message
news:up5FW9zQIHA.5988@TK2MSFTNGP02.phx.gbl...
Thanks Philip for the reply, it made me think of something other than
a faulty HDD.
I removed the bottom cover and first thing I noticed was that the CPU
fan wasn't turning.
That would be a prime reason for this unit to have failed! Nice
one.
Is it likely the CPU is damaged or will the onboard thermal
protection have saved it?
The processor's in-built thermal shutdown mechanism SHOULD have
protected it - it's not something to rely on as a first line of
defence, more as a backstop, but I'd doubt very much that the CPU has
been fried. You need to pursue why the fan isn't turning - use a DVM
and look for a voltage, or a DOM and look for low to medium resistance
across the fan's connection pins (disconnect the fan plug first in
both instances). If the fan is open-circuit (very high resistance),
it's a no-brainer - change the fan and the problem will go away.
Waitaminute...these aren't simple DC fans anymore. One side is ground,
the other power, and the third is speed control via pulses or DC from
the mobo. The wires are not directly connected to motor windings
anymore, thankfully, so simple ohmmeter checks won't work...unless the
leads are all shorted and then you obviously have a bad fan. (The
upside is that if the fan gets jammed it doesn't burn up the windings
and the circuits supplying power. On all of today's computers you can
hold the fan immobile and nothing will go wrong, other than separate
things will get hot.)
If the fan turns easily once the gunk is cleaned out that's a sign it
might be OK. If it turns hard...that's your problem. But you need to
see it run to be sure it works.
-John O
Kenny
The HDD and fan are not the problems then. Have you tried running memory
tests? If you have two memory sticks installed, remove one of them at a
time and see if the problems persist..
--
Mike Hall - MVP
http://msmvps.com/blogs/mikehall/default.aspx
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