I'm unable to connect my lexmark S600 to my compac lab top

Try installing an updated driver: http://bit.ly/oZanCK

If it doesn't work, please contact our technical support team.

The error can be the result of firmware code, printer contacts or the printhead itself failing. There is a firmware update for your model that addresses this problem. Please follow the steps below on how to successfully update your printer.

1. Open the printer cover to remove the printhead. The carrier will come to the center automatically. Once you've taken out the printhead, close the printhead latch and close the printer cover.
2. Proceed with the firmware update. Please visit the Lexmark website to download and install the Lexmark S600 Series Firmware Update.
3. Once the update is complete, re-insert your printhead. Close the printhead latch and check for errors.
4. If no error appears, open the printer cover again to re-insert the cartridges.
5. If that doesn't help, I would highly recommend that you contact Lexmark Technical Support Center for assistance

If you are using one of Lexmark printers that has the new ink system based upon individual tanks (like the following models: S300, S400, S500, S600, Pro200, Pro700, Pro800 & Pro900 Series), these models require all cartridges to have ink them to continue printing.
However, there are some previous Lexmark models that are able to continue printing even if one cartridge is empty.
Should you still need assistance, please leave a comment to my response and I'll get back to you. Should this answer your concern, your rating will be greatly appreciated.

The statement below applies to 2009 Lexmark products: S300, S400, S500, S600, Pro200, Pro700, Pro800 & Pro900 Series

If your device is displaying a 'printhead error' on the hardware and/or you are suddenly experiencing a print quality issue, please contact the Lexmark Technical Support Center at 1-800-539-6275 or point your browser to http://bit.ly/lFKDzs for online technical assistance.

Lexmark agents are prepared and able to help diagnose and resolve your issue. This may involve updating your printer firmware and/or replacing the printhead for your printer, at no charge to you, our customer. Installation is quick and easy for any customer to perform.

Your satisfaction with your Lexmark devices is our primary concern, and we are confident and committed to quickly correcting these issues.

Lexmark recognizes that some of our inkjet all-in-one customers may be experiencing issues with their print quality. We take our customer user experience very seriously, and we strive to ensure that each time a customer prints using a Lexmark device the page is crisp, clear and up to the highest standards.

However, if your device is displaying a 'printhead error' on the hardware and/or you are suddenly experiencing a print quality issue, please contact the Lexmark Technical Support Center at 1-800-539-6275 or point your browser to http://bit.ly/lFKDzs for online technical assistance.

Lexmark agents are prepared and able to help diagnose and resolve your issue. This may involve updating your printer firmware and/or replacing the printhead for your printer, at no charge to you, our customer. Installation is quick and easy for any customer to perform.

Your satisfaction with your Lexmark devices is our primary concern, and we are confident and committed to quickly correcting these issues.

(Statement above applies to US customers with 2009 products: S300, S400, S500, S600, Pro200, Pro700, Pro800 & Pro900 Series)

If you're printer is of older models, please contact Lexmark Technical Support Center for additional assistance.

Check out Lexmark support page article on How to Collapse/Lower the Operator Panel on the Pro200, S300, S400, S500, and S600 Series Printer Models.

Reinstall the driver as per manual
http://publications.lexmark.com/publications/pdfs/2007/s600/LXEDuser-en.pdf

support site for that printer here http://support.lexmark.com/index?locale=en&segment=DOWNLOAD&startover=y&userlocale=EN_US+&question=lexmark+z23&productCode=Z23_COLOR_JETPRINTER&page=answers&detectedProductFacet=CMS-CATEGORY_REF.LEXMARK.PRODUCTS.CONSUMER_INKJET.Z23_COLOR_JETPRINTER&searchid=1272143110978#3 theres dos appear to be a windows 7 driver available - however, windows supports a lot of printer natively and also via windows update - have you tried windows update ?

Here's a link where you can find information regarding Windows 7 support for your printer:
http://support.lexmark.com/index?page=content&userlocale=EN_US&id=HOT18&locale=en&productCode=LEXMARK_X1150&segment=DOWNLOAD&actp=HOTTIPS

Not sure whether the Windows Vista drivers will work on Windows 7 or not, but anyway, here's a link where you can download indows Vista drivers:
http://support.lexmark.com/index?page=content&productCode=LEXMARK_X1150&actp=PRODUCT&id=DR116&segment=DOWNLOAD&userlocale=EN_US&locale=en

Sell your printer Buy a HP!