Re: Computer will power on but not boot up
- From: Paul <nospam@xxxxxxxxxx>
- Date: Fri, 20 Mar 2009 13:41:09 -0400
Mac wrote:
"SC Tom" wrote:
"Mac" <Mac@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:8D95C505-0C05-4A6F-9624-6C4BE511D076@xxxxxxxxxxxxxxxxAll of a sudden my screen went all distorted this morning, so I decided toAre you sure it's not the monitor? Just because there's a power light on doesn't mean it's working. Does it have an OSD, and does it come up?
turn my computer off. Once turned back on the lights come on and the fans run
loud but nothing happens, monitor doesn't even get a signal. I've been on
online forums most of the day and havent found any definitive solutions, just
if's and maybe's. Ive tried swapping out my power supply, hard drive, RAM,
and heatsink fan or whatever, but I get the same result each time. My worst
fear is that it's my motherboard or, heaven forbid, hard drive (since I
currently have nada backed up). Anyone have any ideas what might would have
happened all of a sudden and what could be the problem? Any help would be
appreciated, thanks.
SC Tom
The monitors fine, before when the computer messed up the fans would start loud then gradually go quiet and everything would boot up fine....now the fans continuously run loud and nothing happens otherwise. As for everyone else who responded, thanks I appreciate it, and I'll check the video/graphics card to see if thats the problem.
The fans running fast, means the CPU is not starting. If
the CPU was running, it would be able to do some minimal
programming of the SuperI/O chip, and its fan control
hardware interface. So something is preventing that
BIOS code from running.
Does your computer normally beep once when it starts up ?
Is it still beeping once ? Do you hear no beeps, or some
kind of repeating beep pattern ?
If it is completely silent, whereas before it beeped once,
that too might indicate that the processor is not running
at the current time.
If the computer has a speaker or beeper, you can use that
for some crude testing. If the computer has a separate
video card, removing it should give three beeps. If you
heard the beeps, then you know the CPU is running, as it
makes the beeps. If you removed all the RAM, perhaps you'd hear
two beeps. (Remove hardware or make adjustments, with the
AC power cord disconnected. That protects the hardware from
+5VSB derived voltages in the sockets.) You can do
simple go/no_go tests, by removing the components,
and then interpreting the beep pattern that results.
Some Dell computers, have four diagnostic lights located
somewhere on the computer. A Dell manual may list ten
different codes the display can show. If you had a display
like that, it further adds to what you know about the failure.
Popular failing components, are things like the power
supply. On some Emachines, a power supply failure can
ruin the motherboard. So that one is a double whammy.
On other computers, a new supply may be all that is
needed.
Some receot computers have had the "capacitor plague".
So many computers of that type have failed, that
some entrepreneurs have started web sites dedicated
to fixing those specific computers. So that is another
possibility.
http://www.badcaps.net/images/caps/kt7/image004.png
By you naming the computer (Dell GX280 or the like),
someone may recognize a popular problem it suffers from.
Paul
.
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