Computer won't boot up after disabling hidden devices in Device Manager

[basenyc]

Upgraded network adapter (ENLGA-1320 Gigabit Ethernet PCI Adapter) with drivers and received Code 10 in Windows XP (AMD Athlon processor desktop); with no LAN icon present in Network Connections I attempted to troubleshoot problem by removing old drivers and disabling all WAN miniport hidden devices in Device Manager. Now computer does not boot up and I have no monitor display. How can I get computer to boot up with display?

Distraught novice seeking kind advice asap in laymen's terms . Thank you.

[JJ 3000]

Do you get any image on the screen at all?

[patio]

Boot into safemode and re-enable WAN devices.

[basenyc]

No display at all when computer is turned on so cannot use safe mode.

[JJ 3000]

Do you have another monitor that you can try?

Do you have another computer that you can test that monitor with?

Do you hear any beeps when you turn the computer on?

[patio]

You'ld be suprised...safemode may just give you a display...

[basenyc]

Ok--got computer to boot up--removed new network adapter and rebooted and new hardware wizard keeps showing up even though hardware has been taken out of slot. Need help getting computer to recognize new network adapter to get network connections. Any comers? Already removed old and new NIC drivers.

[JJ 3000]

So when you put the netork card in, the computer wont boot? Is that right?

[patio]

I smell a bad NIC card...

[basenyc]

computer boots up--new hardware wizard does search for new hardware and states "unknown device"  I just removed NIC and placed in different slot and got same new hardware wizard dialog box