System Problems

[Tabasco]

Hello all im new here ive done a search for the problem ive got.. its almost the same as this one.. "Auto Shutdown".. Read
it does it like maybe every 3-4 hrs..and the power button dont work.. i have to unplug it from power supply.. and plug it back in again.. for the button to work..and yesturday.. the screen just went black.. but computer didnt power down.. so i turned it off and on again.. was doing the memmory count and it got to 1meg.. and froze.. so yet again i turned it off again.. went to put it back on.. and then it started doing double beeps.. with a black screen... well today i turned it back on again and it worked.. but has turned off twice today again.. but no double beeps this time.. not sure if its the Power Supply , Graphics card or the memmory could some one please help

Regards
Tab

Specs
Gigabyte K7 Triton (GA-7N400-L1)
BIOS: Award Modular BIOS v6.00PG
Processor: AMD Athlon(tm) XP 2800+, MMX, 3DNow, ~2.1GHz
Memory: 1536MB RAM
NVIDIA GeForce 6600

 

[Tabasco]

Hi ty for your reply the PSU is a Q-Tec PSU 400W DUAL FAN GOLD (atx 12v)
And i have to admit looking inside.. it does seem fluffy on some parts..

 

[Tabasco]

Whats the best way of cleaning inside my computer.. with out blowing it up..

 

[Tabasco]

Thanks schumi84 .. i know my computer is old but it still does what i want it todo.. would be nice to keep it going until i save enough to buy a new one

 

[Tabasco]

Im still having the same problem.. and ive cleaned it out.. not sure... must be the powersupply