Powers Up to Acer Logo and Stops

Hi. My desktop powers on but stalls with the Acer Logo on the screen. Underneath the logo is Del:Enter Setup and F12: Boot Sequence. The computer does not respond to either. I have tried to enter the BIOS using Ctrl/Alt/Esc and still nothing. Tried all the F keys and nothing. I tried to Boot using my XP Disk and nothing. Checked all the connections inside and all seems fine. Tried another HD and nothing. Any help would be appreciated.
The Spec is as follows.

Acer Aspire T180-UB7Z
AMD Athlon 64 x 2 3800+
1GB DDR11
160GB
XP SP3

Thanks. AT