u mean u have just changed the PSU? 1 beep means everythng is healthy, while yours not showing anything, means something is wrong, and if the PSU is new, means there is something wrong with PSU.
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"