My 5800 keeps telling me to unlock it when I click scan, but I can't find the lock anywhere.

To get the Unlock code for the Nokia 5800 Express Music you can reach the site Mobileunlocksolutions.com and buy it ,unlock it,specify the current Network and Country it locked now?Because there you can unlock code for some countries GSM Network not for all,You can enter the code correct using the instructions below:

Nokia 5800 Express Music Unlocking Instructions:

Warning : Do not enter any wrong unlock codes on your Nokia 5800 XpressMusic mobile phones. If you enter over a certain amount of wrong unlock codes on your Nokia 5800 XpressMusic mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+1#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!

Note :For Nokia 5800 XpressMusic mobile phones locked to the network Fido or Rogers in Canada follow these instructions :
1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+7#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!

To get the Unlock code for the Nokia 5800 Express Music you can reach the site Mobileunlocksolutions.com and buy it ,unlock it,specify the current Network and Country it locked now?Because there you can unlock code for some countries GSM Network not for all,You can enter the code correct using the instructions below:

Nokia 5800 Express Music Unlocking Instructions:
Warning : Do not enter any wrong unlock codes on your Nokia 5800 XpressMusic mobile phones. If you enter over a certain amount of wrong unlock codes on your Nokia 5800 XpressMusic mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+1#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!

Note :For Nokia 5800 XpressMusic mobile phones locked to the network Fido or Rogers in Canada follow these instructions :
1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+7#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!

Which Network,in which Country It locked too?
Because all Network lock cannot be Unlocked...I have Unlocked My Nokia 5800 Express Music Using the UNLOCK CODE.So you can use the Unlock code to Unlock the Phone,You can get the Unlock code from here
Theunlockarena and Unlock it....You can follow instructions below and unlock it step by step..

Nokia 5800 XpressMusic Unlocking InstructionsWarning : Do not enter any wrong unlock codes on your Nokia 5800 XpressMusic mobile phones. If you enter over a certain amount of wrong unlock codes on your Nokia 5800 XpressMusic mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+1#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!

Open line means network Unlock,You need to specify which Network,country it locked now?Because Not able to Unlock all country's Network...
You can use the Unlock code to unlock the Phone from Network Lock....You can get the Unlock code from here at Superunlockcodes low cost and get the Free Unlocking instructions from here
Mobileunlockguide and unlock it....


Warning: Do not enter any wrong unlock unlock codes on your Nokia 5800 XpressMusic mobile phones. If you enter over a certain amount of wrong unlock codes on your mobile phone, your phone may get hard locked and sometimes become unusable.

1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+1#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!
Nokia 5800 XpressMusic Unlocking Instructions
Note :For Nokia 5800 XpressMusic mobile phones locked to the network Fido or Rogers in Canada follow these instructions :
1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+7#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!

The letter p appears if you press the button star(*) three times quickly
The letter w appears if you press the button star(*) four times quickly
The symbol + appears if you press the button star(*) two times quickly
The CODE you need to enter is the unique unlock code for your Nokia 5800 XpressMusic

Which Country's Network Lock Do you need it open from ?
To open it from the Network Lock,get the Unlock code and instructions from
Mobile-unlocker and Unlock it.You can follow the instructions below and Unlock it step by step:

Nokia 5800 Express Music Phone Unlocking Instructions :

Warning : Do not enter any wrong unlock codes on your Nokia 5800 XpressMusic mobile phones. If you enter over a certain amount of wrong unlock codes on your Nokia 5800 XpressMusic mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+1#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!

Note :For Nokia 5800 XpressMusic mobile phones locked to the network Fido or Rogers in Canada follow these instructions :
1 - Switch on your Nokia 5800 XpressMusic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 5800 XpressMusic.
3 - Compose #pw+CODE+7#.
4 - The Nokia 5800 XpressMusic would then display the message "SIM Restriction Off" and will be unlocked!

The letter p appears if you press the button star(*) three times quickly
The letter w appears if you press the button star(*) four times quickly
The symbol + appears if you press the button star(*) two times quickly
The CODE you need to enter is the unique unlock code for your Nokia 5800 XpressMusic

There is no lock on the Visioneer 5800 USB scanner. I had the same problem with my 5800 and finally noticed that the scanner lamp was going bad. I replaced it with a good lamp out of an old Acer parallel port scanner that even had the same plug, noticed that an older HP that I have sitting around would have interchanged as well. My 5800 now works great and has been tried on both 98SE and XP with SP2.

I think this locking tab is on the carriage, under the cover you lift to replace the ink cartridges.

Ensure you are using the power supply that was provided with the scanner.

The power through the strip may be fluctuating and causing the problem.

Download and install the driver provided on the 5800 USB support website.

http://www.visioneer.com/support/flatbed/5800downloads.asp

i was getting this message when i was using the wrong power supply, i used a diffrent power supply and restarted the computer and it no longer says it, so i couldnt tell you exactly which one made it work, but now i get a box telling me i dont have enough disk space??? any anwsers for that??

Most scanners shipped have a lock on them to prevent the top from opening up and damaging the glass. This is a screw type mabey other but a penny fits in mine. This may not be the case for you but look in your manual to find the unlock device.
This will also in some scanners prevent the stepper motor from moving in transit . The stepper motor is the device thats makes the bar slide up and down to scan the page.
Hope this helped some.
Kevin