just installed a mobo but

Yoa have the ATI 9250 video card but what about the mobo, RAM and
CPU..?

First of all are you getting the single bios bleep when you power up?
Without this 'bios boot' or POST (Power On Self Test) nothing will
happen.

You will get the bleep or be able to access the bios screen with just
the CPU, Graphic card and RAM installed the rest can be
disconnected... inc. the hard drive, this bios POST should be your
first goal as without it nothing will ever happen apart from the fans
spinning....

... some mobo's require the use of an internal speaker connected, some
mobo's might have one on the mobo, at least if all is well having no
speaker should not stop you getting into bios set up screen, the
reason for this speaker or 'sounder' is to indicate error codes only.


The first thing I would suggest is to double check the mobo FSB speed
settings, usually links or switches... still no joy then it's back to
square one ensure the cards are inserted properly... more so the
Graphic and RAM cards and that the mobo is mounted correctly and
nothing shorting underneath where the mounted screw's are located.

I would leave checking the CPU as the very last thing to do simply to
avoid any damage, did you use a thermal pad and removed the backing
paper or did you use heatsink paste.. it is all too erasy to bend or
damage the cpu pins.

davy