|"I ran H/P tests and they say the monitor, video card are both working correctly.|
Could it be the video card failing? is it the same as the graphics card?"
The HP tests said it was okay didn't they? It's the same thing as the graphics card in your case - the name for it in Device Manager is the Display Adapter.
- do not necessarily indicate a problem with the display adapter or the monitor.
- are extremely unlikely to be caused by the video drivers, or by a virus or other malware. I have seen some video drivers that cause the display to blink to black while booting, but not once the desktop loads.
You could rule out your monitor altogether by trying it on another computer!
What I think is most likely is
- you have reloaded Windows fron scratch since the last time the monitor worked properly, but you have not loaded the drivers for the main mboard chipset yet. That can easily cause problems because in that case Windows does not have the proper information about the mboard chipset - either the onboard display adapter is not recognized properly if you are using it, AND/OR - whether you use the onboard display adapter or a card in a slot, Windows doesn't have the proper info about the ACPI/APM hardware support on the mboard, which may cause strange problems such as going into Standby randomly, or possibly blinking video.
- AND/OR - you have an LCD monitor and your monitor is using Plug and Play Monitor in Display - Settings. The problem with that is the Plug and Play Monitor driver was written for CRT monitors, and LCD monitors often can't use some of the settings - either there is no display at all, or the display setting doesn't work properly. The cure is to either never use the settings provided by Plug and Play Monitor in combo with your video drivers that don't get along with your LCD monitor, or, the best solution, you load the proper drivers for your LCD monitor model - in that case Windows by default will not show you any settings available in combo with the video drivers that will not work properly with your LCD monitor.
HP a250n desktop
HP Pavilion a250n Desktop PC - all support:
HP Pavilion a250n Desktop PC - Product Specifications
Chipset: 865G (Intel)
If you have not loaded the main chipset drivers since the last time Windows Setup was run from scratch, get at least the INF update utility from here:
1. The INF Update Utility
If Windows Setup was run from scratch, you may also need these:
5. Graphics Driver if you are using the onboard video
11. RAID/ACHI Software if you are using the SATA controller.
You DO NOT have to use RAID, but the drivers for the SATA controller are in this.
Your mboard may have come with a floppy that has the same stuff as this on it.
22. Floppy Configuration Utility - if you need a floppy with both SATA drivers and the minimal support to use the Intel Matrix Storage Manager.
"Creates floppy disk for 32-bit OS with Intel® Matrix Storage Manager 188.8.131.525 files - used to preinstall RAID driver (F6 during Windows* setup)"
Motherboard manufacturer: ASUS
HP and Compaq Desktop PCs - Motherboard Specifications, P4SD-LA (Stingray):
Manufacturer's name - ASUS P4SD-LA
If you want more info about the mboard, look on the Asus web sites - they may have a Retail version of the same model (with an Asus bios version).
Other Downloads you may need, whether or not Windows Setup was run from scratch: