|"...I am only able to use 8bit display..."|
In that case, either
- you probably don't have the proper video drivers loaded.
Go to the HP web site and find the software downloads for your model, download the graphics drivers and load them.
- or - the graphics drivers have been installed but they're corrupted. In that case, un-install any listing for them in Add/Remove Programs. Go to Device Manager - Display Adapters
If something other than some sort of standard VGA adapter is listed, RIGHT click on the listing, and choose Un-install - DO NOT re-boot the computer at that point - install the graphics drivers, then re-boot.
Once the proper graphics drivers have been loaded, you should see Plug and Play Monitor in Control Panel - Display Properties - Settings, and you should have more resolution and numbers of colors choices.
If that says Default Monitor, you will have fewer resolution and numbers of colors choices (it always says Default Monitor or Unknown monitor there there in normal mode if the proper graphics drivers have not been loaded).
In that case go to Control Panel - Display Properties - Settings - Advanced button - Monitor, and change the Driver for the monitor to Plug and Play Monitor.
If you have re-loaded Windows from scratch.....
Whenever you load Windows from a regular Windows CD (or DVD) from scratch, after Setup is finished you must load the drivers for the mboard, particularly the main chipset drivers, in order for Windows to have the proper drivers for and information about your mboard hardware, including it's AGP or PCI-E, ACPI, USB 2.0 if it has it, and hard drive controller support. If you have a generic system and have the CD that came with the mboard, all the necessary drivers are on it. If you load drivers from the web, brand name system builders and mboard makers often DO NOT have the main chipset drivers listed in the downloads for your model - in that case you must go to the maker of the main chipset's web site, get the drivers, and load them.
It is especially important to load the main chipset drivers for your notebook chipset, because otherwise Windows often doesn't recognize the chipset and all the devices built into the motherboard to do with that properly.
All LCD displays have a specified "native" or "optimal" resolution they look best set in when set to - other resolutions will not look as good, the most noticable thing being the text on the screen will not look as clear.
Turn on Clear Type in Windows XP or Vista - makes type/fonts on LCD screens look clearer.
There are standard 4:3 ratio resolutions (e.g. 800x600, 1024x768, 1280 x1024) and sometimes wide screen ratio (e.g. 16:9 ratio; 1280x768) resolutions to choose from in Windows.
The display is either the standard 4:3 ratio display (if it is more than about 4 years old) or a widescreen ratio display (if it is newer than about 4 years old).
If you choose a standard resolution for a widescreen display, either the display will look stretched horizontally, or there will be black areas right and left.
If you choose a widescreen resolution for a standard display, either the display will look stretched vertically, or there will be black areas top and bottom.