When turning on i keep getting an errr message, and cannot boot up system

SOURCE: my ibm thinkpad t40,syas error 1802 unauthorized

my cd room dont work it makes sound like its reading cd and couple secound latter it ejects cd

SOURCE: Error Message on boot

Hi,
IBM requires using a "branded" network adapter, meaning one that has IBM's name on it, no matter if it's broadcom,etc. There is a couple of workarounds for this problem which would enable you to use whatever wireless adapter you wish. I would google IBM R40, and error 1802 and you'll find the application you need. Unfortunately, I'm not able to offer it to you here.
Good luck

SOURCE: IBM R40 2722 1802 Error Message

check the booting priority maybe the first booting device is set to network that's why

SOURCE: system will not boot up.

Thinkpads have readable "FRU" (Field Replaceable Unit) numbers storedon various components, and at boot up time, for those internal devices(fortunately excluding drive, memory, etc) if they do not "respondcorrectly" saying they are a valid IBM part, they will give this 1802error.

It could be that the referenced device has failed, and thus seems to be there but not responding; it could need reseating;

The Lenovo site should be able to help you with a service guide to remove the card and see if that works.

there is also a "hack" to change the bios of machine - I think "prior to T43" to delete the 1802 check:
http://www.command-tab.com/2006/02/26/thinkpad-1802-error-fix/

Be aware any "hack" can disable the machine completely!

If it does turn out to be the mini PCI network card, you can tryremoving it and going with USB (did 600s' HAVE usb? I can't remembermine any more) or try to find a "genuine" IBM replacement on eBay orITxchange.com