|If you get video before Windows is supposed to load, then no video in Windows, that's usually easy to fix. |
If you're getting no video at all, your onboard video isn't necessarily damaged - it's more likely something else is wrong.
If you also have a PCI-E or AGP video card installed in a slot, the bios disables the onboard video automatically when a video card is installed in one of those slots. .
If your onboard video were damaged, if nothing else is wrong, you should hear a mboard beep pattern - e.g. two short beeps and a long one.
If you hear no beeps at all, no video and no beeps can be caused by:
- most frequently - your power supply is failing or dead
If it's dead, nothing happens when you press the Power button.
Failing power supplies are common and can cause your symptoms.
Check your PS.
They often partially work, fans and hard drives may spin, leds may come on, yet you may get no video and the mboard will not boot all the way.
See response 4 in this:
- at least one of the ram modules installed is not compatible with using it in your mboard
It is easy to test for incompatible ram that has caused your mboard to fail to boot.
Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.
- one or more cards in mboard slots are not all the way down in their slots
- your ram is not all the way down in it's slots, or it has a poor connection in it's slots
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
"If you're 100% sure the onboard is bad, you will have to install an actual video card. And since you have a crappy SFF system, you will have to get an low profile AGP card."
You often have another problem with a small form factor system - the PS capacity - output wattage - is often puny - there are very few video cards that have video chipsets that can be used on a system that has less than a 250 watt PS without eventually damaging the PS.
If you need to replace the PS, search the web using the Compaq or HP part number on the PS - you may find that you can get a PS with a greater wattage capacity that will fit inside the case.