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I would always recommend a fresh install of Windows when buying a second hand laptop. You then know exactly what operating system is installed and can get the relevant drivers quickly and easily.
Press and hold the "Windows" key, then press the "Pause/Break" button. This will show you your version of Windows. Then you would need to find the manufacturer's website for the dongle and download the relevant drivers for your version of Windows.
First, make sure you have a wireless adapter. Not all notebooks have them and you may have to buy one.
Then make sure it is turned on and recognized by your computer.
Finally, search for the wireless network and enter the network key or password.
The person who set up the wireless network will be able to provide this if you don't have it already.
I have just done this. One needs to dismantle the laptop first. Solder a push button switch with extended wires across pins 4&5 of the serial eeprom 24c02. Then reconnect the screen, keyboard & a/c power pack. with a tooth pick press power on switch whilst holding push button on. When the factory mode screen comes on release the push button. Next go to bios setup F2 and ALT-p to the password page. Now enter your new password this will overwrite the old pass word. My approach is slightly different to this following method as it is les likely to brick the laptop. http://www.archive.org/web/2003110302606
this time your DELL LATITUDE is hang-up, why because the motherboard find some devices connected which are no longer exist... Here's what you do for now, remove the jumper switch to reset the cmos setting to clear and back to normal, you can see jumper very near to the cmos battery... if the problems exist again tell me how many numbers of beeps.. heres my email: email@example.com...
To increase or decrease the backlight brightness use Fn-key(next to left Ctrl-key) with up and down arrows.
There is not some key-combination to turn off the screen, you can make your computer turn it off after some time (if you're using XP this can be done in control panel->Power options), or just close the lid :)
Something to try would be to re-seat the ram and harddrive.
just take them out and then put them back in and try again. I would try with the battery out and just the ac power plugged in.
Being that it was bought off eBay, realistically it probably got banged around a little bit. Sometimes if one of the devices are not making a real good contact it can cause these problems. I have also seen bad batteries cause this problem.
This is not necessarily going to fix your problem, but it has occasionally worked for me in the past and it is a very quick and free thing to try.