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well if you did not remove the video card from the machine then it is still pumping out video on that cards connection. bios will recognize the only working video out but if you have a card in it it will choose the video card over the on board video. So reconnect the old monitor to the old video card and see if it will work. if it does then remove the video card after shutting down and reboot the monitor connected to the on board video. The new configuration should be recognized, then shut down and place the new monitor in the on board video port. now the monitor may need to be told to look at the correct port either digital or rgb.
It could be your video either the on board Video or the card you have installed. If you installed a Video card make sure it is fully seated and properly installed. If you are using the on board video make sure you have the jumpers set correctly and you have no bent pins on your cable to the monitor. Test the monitor on another computer to be sure the monitor is working.
This is usually a video card or RAM issue. Make sure you got the right RAM (ie - correct speed and size [not too large/over specs]) and re-seat the video card. Also try resetting the CMOS. As I recall, there is a jumper near the battery to do this. With power off, move the jumper to the other set of pins, then back again after about 10 seconds, then re-power the board.
Try using only one memory stick. 1 long 2 short is a memory issue. Clean the memory contacts and reinsert the RAM.
Clean and reinsert the video card. 1 long and 3 short is a video issue. Try a different video card if you have one.
I've got a via p4m266. and I've found that it does that if you put the cmos reset jumpers on the reset setting. check for one stand alone jumper across 3-pins, check readings on board for location of cmos reset jumpers & move jumper to bridge the unbridged connection.
Well you didn't post what your operating system is. So I'll guess it's Win-XP. So you see the splash screen for the motherboard & thats it. I suggest you clear the cmos. With the Pc turned off, unplug the power cable from the Pc. Look in your manual on pg. 1-15. With the help of a flat tip screw driver lift the battery out of its scoket. Than you need to clear the bios to its original Mfg's. settings, by moving the the jumper from it's curren position which is set on pin 1 & 2. Changing it to pins 2 & 3. Leave this there for a few seconds. Than put the jumper back to pins 1& 2. Replace the battery. Plug in the power cord & boot the Pc. While the Pc begians run press the Delete key on the keyboard every two seconds. The Bios screen will display. You will be in the first page of the bios named Main. This is where the time & date are listed which you will need to reset. At the bottom of this window are instructions on how to navagate through the bios & how to change settings. Only you know what the motherboard is running & need to check all the setting to reflect your current devices. If your confused seek help in the manual. If your still confused inlist the help of someone that can. Once the cmos has been configured you Pc may very well boot correctly. This is only one step of what could be many depending what is holding back the system from completly booting. It's not the monitor. It works. If it didn't you would not see anything but re-check you connection between the PC's video output & monitor cable connection. Another check that must be checked. To continue I'll need to know if you are using the Intergrated UniChrom graphics card for video display or an add in card in the boards AGP slot. I'll be checking back to see if you have posted any new information.
If you get a beep when you turn on the computer that means its working, multiple beeps indicate an error, no beeps at all mean that the processor is not initiliazing..
turn off computer and unplug it
1.) locate the jumper called or labled jp1
2.) its a 2 pin jumper and is currently set to 1 and 2
3) set it to 3 and 4
4.) set it back to 1 and 2
5.) try turning on the system
if you cant locate the jumper or yours is different what we are trying to achieve here is clearing the cmos. this can be done using the jumper or
1.) unplug your system
2.) remove the memory
3.) remove the battery
4.) press the power button 5 times to discharge the capicators
5.) replace batter
6.) replace memory
Try booting it now
if the above fails
try taking out your processor and putting it back in
if your mainboard has a clockspeed setting ensure it is set according to your porcessor clock speed (look at manual for details)
ensure you got all the necessary power cables connected
If you had the problem before you changed our processor then it night have been your mainboard that needs changing.
If you have a video card,ensure that the monitor is plugged into your videocard and not the onboard video the mainboard comes with.
Try your processor on another system to ensure its working, just cause it new doesnt mean it is good.
You can try clearing the cmos multiple times with the memory pluged in or without the memory to see if that helps
if all else fails then ensure you check the processor , only if the processor is good replace your main board..