PC doesnt turn on sometimes

[The_Ultimate]

I made this computer in the summer of 2005, it was works good but starting it is sometimes trouble. When the computer is off theres this constant low beep coming from the computer, and to start it i always have to turn off the power supply and wait till the beep goes away, then i turn it on and press the on button about 2 times.

Heres the specs of my comp:

MB|MSI NF4 K8N NEO4-F RTL
http://www.newegg.com/Product/Product.asp?Item=N82E16813130491

CPU AMD 64 |3000+ ATHLON 64 939P RT
http://www.newegg.com/Product/Product.asp?Item=N82E16819103537

DDR CRSR 512MB X2 KIT|VS1GBKIT400
http://www.newegg.com/Product/Product.asp?Item=N82E16820145440

HD 80 GB|SEAGAT ST380817AS 8mb % - OEM
http://www.newegg.com/Product/Product.asp?Item=N82E16822148148

DVD+/-RW LITEON SOHW-1673S BLK RT - Retail


VGA LEADTEK GF PX6600GT TDH RT - Retail
http://www.newegg.com/Product/Product.asp?Item=N82E16814130064

POWER SP| XCLIO 450W 450BL BLK RTL - Retail
http://www.newegg.com/Product/Product.asp?Item=N82E16817189003

CASE SUNBEAM|IC-SA-SIRT
http://www.newegg.com/Product/Product.asp?Item=N82E16811166001

sorry about the double. delete this one please

[TwoRails]

Dup thread, this one has already has posts:

http://forum.pcmech.com/showthread.php?t=169183