Need help , pc freezes

[Helltower]

Hey, ive got a

AMD 3500+ , Nvidia 6600GT , Audigy 2 zs soundcard , and a A8N-SLi Deluxe asus motherboard ,with a 380w antec power suply.

It all worked fine untill yesterday , normally my pc is on for day and night , but when i got out of my bed yesterday and wanted to take a look at my emails , my screen didnt react anymore. so i had to reboot but then it suddenly freezes at the bios startup screen (not windows). but sometimes my pc wont even show anything... I didnt install anything special and ive got the pc for a year and a half now. Friends told me that it might be something with the power supply,motherboard , cpu or gfx card...
I had the same problem a few days ago , came back from school , watched my pc but was freezed in windows , took the power supply cable out for a few hours and reboot , then it worked...Now ive almost tried everything , removed my gfx card , ram , soundcard , and sometimes i get a long beep when i try to start it up then. Any help would be very welcome cuz i realy need the computer asap.
please...

[Darkdrakon]

it sounds like it could be overheating... check your case fans, then all the others, vido, cpu, and powersupply.

[Helltower]

didt that , seems like the powersupply gets warm in a few seconds but isnt that normal?

[Darkdrakon]

depends...mine dosen't warm up much and I have a 480 watt supply.

[Helltower]

hmmm well i gave it to the store and getting it back tommorow , so ill see then