Power up problem

[donjo13]

My PC will not power up if the Ethernet cable is plugged in to the ethernet connection on the back of the PC. The second I unplug it the juice starts flowing. I can then plug it back in and everything is fine. ????? Any ideas?

Computer:
Operating System Microsoft Windows XP Professional
OS Service Pack Service Pack 2
DirectX 4.08.01.0810 (DirectX 8.1)
Computer Name CELERON-1700
User Name Alice

Motherboard:
CPU Type Intel Celeron, 1700 MHz (17 x 100)
Motherboard Name ECS L4VXA2/L4VXAG / Kobian KOB P4X400 NDSX / Matsonic MS9127C / Syntax SVX400
Motherboard Chipset VIA VT8754 Apollo P4X400
System Memory 512 MB (PC2700 DDR SDRAM)
BIOS Type Award (11/19/03)
Communication Port Communications Port (COM1)
Communication Port Communications Port (COM2)
Communication Port ECP Printer Port (LPT1)

Display:
Video Adapter Matrox Graphics Mystique 220 (4 MB)
3D Accelerator Matrox Mystique
Monitor Dell E771a [17" CRT] (8J8541CJ8052)

Multimedia:
Audio Adapter VIA AC'97 Enhanced Audio Controller

Storage:
IDE Controller VIA Bus Master IDE Controller
Floppy Drive Floppy disk drive

Input:
Keyboard Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse PS/2 Compatible Mouse

Network:
Network Adapter VIA Rhine II Fast Ethernet Adapter (192.168.123.126)
Modem Generic SoftK56

Peripherals:
USB1 Controller VIA VT83C572 PCI-USB Controller
USB1 Controller VIA VT83C572 PCI-USB Controller
USB1 Controller VIA VT83C572 PCI-USB Controller
USB2 Controller VIA USB 2.0 Enhanced Host Controller