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Sounds like your monitor is bad. Try another monitor because if the video card was bad and the monitor is working you would get a No Signal message on the screen. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok, then your original monitor is bad. If the Borrowed monitor does the same as your original monitor and does not display anything, then there is an issue with your video card.
Initially check the monitor whether it is working good you can check it by removing the monitor cable from the system when you remove cable you will able to see question mark in case of crt monitor this ensures your monitor is working good. when you power the system whether processor works if the processor works means you can conclude that the problem is with the ram or the video parts of mother board. Clear the dust in the ram slot and reinsert the ram
Then remove the cmos battery of the system and reset the bios settings.
Check whether the power cables are correct.
then power on the system if you receive display the problem is solved.
If the display does not appear check by replacing the new ram then giving motherboard to service centre
If you hear your computer beep once then your system has no problem. If it does'nt show a display, try to check the power of your monitor, if it has power. Check the power cords and also the vga connection.
There is no problem with ur system board.
Actually you are getting this problem because of Monitor problem.
The possible cause would be:
1. Your data cable connecting your board failed.
2. The display IC of your monitor failed.
3. If you have Video card then remove video card and try connecting data cable to monitor port other than ur video card.
most probably u are dealing this problem due to failure of ur display IC.
Troubleshoot first by connecting other monitor with ur system if available.
It sounds like your struggles may have damaged the motherboard. See other issues in this forum with this motherboard - partcularly with bowing of the board. Too much bowing can cause internal traces in the PCB to break. Only way to tell now is have it professionally looked at.