British-type siren on startup

My dad's computer refuses to boot. Upon turning the computer on, all we
get is a siren that sounds somewhat like the British emergency/police
sirens. No picture on the monitor, no messages of any kind; just the
siren. I finally got around to taking my computer over to his house,
and While he fiddled around on mine, I took his cover off. There does
not seem to be anything loose, broken, or missing. He says that it is
my fault, because his hard drive refused to defrag, so I used safe-mode
to clean things up. Apparently, this siren thing started a couple of
days after I defragged for him. I went to a website that offers clues
about different beeps and what they mean, but there was nothing
describing this siren thing. Does anyone have the slightest idea what
might be going on?

 

Check yer fans see if any have seized or running slow, especially the
processor fan

 

If it's an Award BIOS, a high/low tone indicates a bad CPU. See this:
http://www.amptron.com/html/bios.beepcodes.html

 

This was one symptom that abit boards with failed caps exhibited and also a
symptom exhibited by some boards that had "cpu fan failure" protection.
You'll have to open the case up and have a look at capacitors around the cpu
socket. The tops should look flat or slightly concave. It the tops are
raised or rounded or there is any sign of leakage, then the motherboard is
failing.

 

If it's an Award BIOS, a high/low tone indicates a bad CPU. See this:
http://www.amptron.com/html/bios.beepcodes.html

 

Good point. To add to that, here is a site with pictures of bad
capacitors so you get an idea of what to look for. They also do repairs
to MB's. Also, it's possible the fan on the CPU heatsink is bad and
stopped or is very dirty and turning too slowly.
http://www.motherboardrepair.com/index.php?sec=images

 

Whatever the problem is...it was not caused by defragging in safe mode.

 

Possibly a trojan virus or something like that?

 

Thank you all for the replies (except Tim). It does look like CPU
failure, then, so we will take it in to a pro.

: PuppyKatt wrote:
: > My dad's computer refuses to boot. Upon turning the computer on,
all
: > we get is a siren that sounds somewhat like the British
: > emergency/police sirens. No picture on the monitor, no messages of
: > any kind; just the siren. I finally got around to taking my
computer
: > over to his house, and While he fiddled around on mine, I took his
: > cover off. There does not seem to be anything loose, broken, or
: > missing. He says that it is my fault, because his hard drive
refused
: > to defrag, so I used safe-mode to clean things up. Apparently, this
: > siren thing started a couple of days after I defragged for him. I
: > went to a website that offers clues about different beeps and what
: > they mean, but there was nothing describing this siren thing. Does
: > anyone have the slightest idea what might be going on?
:
: If it's an Award BIOS, a high/low tone indicates a bad CPU. See this:
: http://www.amptron.com/html/bios.beepcodes.html
:
:
: --
: "I love deadlines. I love the whooshing noise they make as they go
by."
: Douglas Adams
:
:

 

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DataSpider came up with this:

Yeah, sure. But reading the OP's post I understand the "sirene" sound
comes up upon boot so the harddrive isn't acessed at that time. Where was
that MBR again? Oh, on the harddisk.

It's some kind of hardware failure and I recommend the OP to read the
replies, especially those concerning CPU fans.

HAND

 

Huh?

Maybe his wasn't a good answer, it wasn't a wrong answer.