If you know the old password then you can go to Accounts in the System Preferences and change it there.
If you can't remember it then if your computer came "Brand New" with a disk then yes you need the disk to boot to to change the password. If it came without a disk and you have to boot to the reinstallation/ Utility/restore partition (sorry, can't remember the right name) then you just reboot into that partition and do the same thing.
There are so many way's to recover it. Please do mention what kind of password do you want to recover in the PC weather it is of windows admin password , excel password, ms word password or it is a bios password. For windows admin password just you need to restart the computer and then press F8 and start your computer in the save mode and then go to control panel and reset your admin password. If you are not able to reset, try third party password recovery software, which will secure and safely recover/reset admin password. If you can't recover your password with above written method, then you need to use password recovery software to reset/ recover every type of password like to reset windows admin password you can use Password Recovery Software.
No, removing the bios battery on a laptop will not reset bios settings.
I am sure you are asking for the default password for the admin account on safe mode. It is a blank password. If not, try admin or 1234.
The default username and password for a Linksys modem router should be "admin" and "admin", the same thing for both. You can reset your router by using the reset button the back of it.
If the Admin password is not known, it is possible to reset the admin password using the Mac OS X install disc that came with the computer (or a retail version). Simply boot from the disc holding the 'c' key down, and proceed to the Install screen. Find the Password Reset utility (it will either be under the Install menu or the Utilities menu, depending on the version of Mac OS X), and then follow the instructions to reset the password. If the System Administrator (or root) password is unknown, there is no way to reset it. The hard drive must be erased and Mac OS X installed from scratch.
If you mean that you want to restart your MacBook without disks, this is quite easily done by holding done the "Ctrl" and both "Apple command" keys and hit the power button, the MacBook will restart, closing all applications. Make sure you save your work beforehand. If you want you want to restore your MaBook, this cannot be done without your Mac OS install disk. If you do not have your Mac OS install disks and wish to restore your MacBook, you should either purchase a box set of Mac OS with your desired version or take your MacBook into an authorized Apple service centre with your original purchase documents and warranty details.
by removing cmos battery
Most of the time it is 1234 or 12345. Check the handboo or call the manufactor if this fails.
The default password for the D-Link 624 is admin as the username and the password is left blank.If you have changed the password you can reset the router by inserting a paperclip or pen tip into the reset button beside the power cord on the back of the router for 10-15 seconds. After resetting the router the username and password will be reset to the default state above.
If you haven't changed the password for your Linksys router, it is admin. If you have changed the password, then I see no other way to reset the router and configure the router from the beginning.
By default for Linksys routers, the user name is empty, and the password is 'admin' For D-Link routers, the default user name is 'admin' and the password is empty. Try that out, but if you've changed your user name or password and can't remember it, then you would have to do a reboot of your router by holding the reset button for about 10 seconds.
If it's a password lock out there is nothing you can do. The installation disk will allow you to reset the password.