help an alarm keeps going of on my vaio going mad :-(

[madxbri]

Hi all this is my first post so please bear with me i am new to this forum
ok i have a vaio desktop model PCV-RX402
it has been a great machine for the last year for me but a few months ago an alarm in my pc kept going of and a phone call to sony said it needs to be sent in to be sorted (now out of warante) so i investigated a bit and found out it was due to my firewall (zone alarm not a plug for them jsut for info )
so i found out i needed an update from them and this sorted the problem no alarms ect for a few months now it has started again flashing purple and blue light and a loud singal alarm pitch from the pc i have tryd to update my firewall and i have uninstaled it to try that but still dose the same now
this might help someone if they know when it happens

works fine while browsing no alarm ect
happens when i appear to be doing a heavy task i converting things from my camcorder (sony) to vcd ect
or playing some games
could this be my processor that is over heating or something
dose anyone know how i can find out if it is overheating ect i have done a complete reboot of my machine took every thing out so no program probs ect any one know what else would set this alarm of cause sony dont seam to know what it could be
thanks all in advance hope someone can make sense of this for me

[Snipes]

Agreed Kee-Lo, but i have an excuse, i was away from home for a few months, and my pc just kept on collecting lol, we live in a dusty age now, thats all i can say hehe

[kee-lo_]

Oh I know, it's quite a dusty world when you think of it!