This time you will follow my recommendations! Or you will deal with your problems without me!
I need to know which monitor you use, if it is Dell, then which model (there are drivers for each Dell monitor)?
Next you will have to flash (upgrade) your BIOS - you have first version and there are many more were made after yours, so instructions are follows
Inspiron 531/531s System BIOS 1.0.13
Release Date: 2/19/2009
Importance: Recommended
Link
http://ftp.dell.com/bios/I531_1013.EXE
Installation Instructions
The file I531_1013.EXE is using the Hard Drive format and is designed to be directly executed from Windows environments.
1.
Click Download now.
The File Download window appears.
2.
Click the Save button.
The Save As window appears.
3.
Select Desktop using the drop-down menu to the right of Save in.
4.
Click the Save button.
A progress meter moves as the download is completed.
5.
If necessary, click X in the upper right-hand corner of the Download Progress Window to close it upon completion.
NOTE: Shut down all other applications prior to running the BIOS update utility. The update utility reboots your system in order to get the new BIOS loaded.
7.
Double click the Icon on your desktop labeled I531_1013.EXE.
The Dell Bios Flash window appears
8.
Click the Continue button.
The message Pressing OK will close all applications, shut down Windows, Flash the BIOS, then reboot. appears.
9.
Click the OK button.
The system will restart and the Bios Flash will be completed.
After this done, you would have to reinstall your Windows one more time, since you jumped ahead and missed a few important drivers, which must be installed first, prior to installation of everything else. I will supply the links, when you are ready. Please record all steps you have taken after last installation, so it would be easy for you to repeat them.
When you update your BIOS let me know, and don't forget about Monitor manufacturer, if it is non Dell, it doesn't matter, if Dell it is matters a lot!
If you respond late and I would not be able to answer today, you will get your next steps tomorrow at about the same time as of now.