My Monitor is not showing anything when i press the start button

[Beelo]

after i was trying to upgrade from windows 7 to windows 8 i restarted my computer to try to upgrade it then when i pressed on the start button nothing showed up ( the screen was black ) and i usually get a "beep" when the computer turns on but this time i didnt ( i can hear the fan is on ). And i tried to connect my monitor to another computer to see if the monitor is the problem but it worked. ( im using my laptop to post this )
Thnx for reading



Regards, Beelo

 

[HarriePateman]

Can you describe the beep, was it long or short? was there 2 or even 3 beeps?

 

[gregrocker]

Are you getting BIOS post screen? What happens if you tap the BIOS setup or Boot menu key at startup?

Can you try another monitor?

 

[Ztruker]

May be caused by defective memory. Try removing 1/2 the memory and see if it will boot. If not, swap the memory and try again. If it boots either time then replace the defective memory SIMM.