|Does your power supply have enough capacity ?|
The Geforce 4 MX 4000 video chipset requires a recommended minimum 250 watt (max total power output rating) power supply be on your system - does your system have at least that ?
If no, an inadequate power supply may allow the card to work anyway for a while but the power supply is eventually damaged from being constantly overloaded, and eventually it may no longer allow the system to boot when the card is installed because of the card's current (amperage) requirements.
In that case, the card will work fine and the system will boot fine when the card is installed if the system has an adequate capacity power supply.
If yes, it has at least 250 watts capacity.....
What make and model is it ? El-cheapo power supplies are much more likely to cause you problems.
Is it's fan spinning properly ? Can you feel it output a reasonable amount of air ?
In any case, failing power supplies are common. You could try connecting a different used power supply, if one is available to you, e.g. from a system you or a friend has, without installing it in your system's case if you need to do that.
"... I also noticed it does not boot beyond the initial screen. "
Screen ? Are you seeing video BEFORE Windows loads while booting ?
The Geforce 4 MX 4000 AGP's chipset , or any video chipset, does not require drivers on the hard drive to produce video while booting - there should always be video BEFORE Windows loads.
If you have no display AFTER Windows starts to load, that's a problem that's usually easy to fix.
If you DO have video while booting, there may be nothing wrong with the card and replacing the power supply may fix your problem.
In that case, the card will work fine connected to another system with an adequate power supply.
If you have no video at ball while booting from the Geforce 4 MX 4000 AGP card, the card probably has a poor connection or it's fried. Either thing can cause the computer to not boot normally when the card is installed
Does it have a fan on it ? If so, is it still spinning properly ?
If it does and it isn't, the video chip the fan cools may be fried.
The card must be all the way down in the slot.
If you plug in or unplug a video card while the power supply still has AC power to it and the PS itself is switched on, the mboard always has power in some places even when the computer is NOT runninfg including some of the contacts in the AGP slot, and the video card is easily damaged.
If the AGP card was NOT fastened down to the case at any time, all it takes for it to be damaged is for it to move slightly upwards in it's slot, such as when you plug in or unlpug the cablre to a monitor, when the PS has AC power, whether the computer was running at the time or not.
AGP cards / AGP slots are especially vulnerable because the contacts on the card and in the slot are in two staggered vertical levels.
If you can, try the Geforce 4 MX 4000 with another mboard to rule out a possible AGP slot vwith damaged circuits on your mboard, but it's likely you'll get similar symptoms when it's on the other mboard.