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Right click on any open space on your desktop go to display, go to advanced and change power options to never turn off display that's for XP. For Vista or Windows 7 type power options into the search bar click on it's link and then change plan settings.
Try to log in using the account name administrator and no
If you cannot change the account name press CTRL+ ALT+DELETE two times then type administrator for the user name. Do
not type a password in the password box just click OK and hope that who set up
the computer did not select a password. If this works proceed to the next
paragraph, if it did not restart your computer pressing the F8 key during the
boot screen until you can select the safe mode. When you get into windows select start then run.
Type control userpasswords2, and then click OK. Select your user
name which you forgot the password and select Reset Password. Type in a new
password and select OK. You now have a new password for that account.
First off I would troubleshoot the NIC onboard, but if it is not working then you should have an available PCI slot to install a new NIC. However you will also have to disable the onboard NIC in the BIOS.
If you are using windows
Click --Start --run-- type in cmd and hit <enter> (this will bring up the dos box)
then type ipconfig /all
It should come back and show: Connetion-specific DNS Suffix : xxxxx.xxxx.com Description: Brand and type of NIC Physical Address : xx-xx-xx-xx-xx-xx DHCP Enabled: yes or no AutoConfiguration Enabled: yes or no IP Address: xxx.xxx.xxx.xxx Subnet mask: xxx.xxx.xxx.xxx Lease Obtained: date when it connected Lease Expires: date when connection expires Default Gateway: xxx.xxx.xxx.xxx DHCP Servers: xxx.xxx.xxx.xxx DNS Servers: xxx.xxx.xxx.xxx
If all this is showing correct then try typing ping 127.0.0.1 this will be the NIC itself and it should reply back. If not then do the following.
If it does not show up then check device manager and see if the NIC is disabled. if it is disabled try reenabling it. if it is not unistall the device and then reboot the PC it should find the NIC and install it. if all this fails then replace the NIC