Windows 10: Why is my laptop Compaq Presario C700 showing blank screen?

Laptop is Compaq Presario C700. Its an old model. I reinstalled Windows 7 Ultimate using a bootable pendrive. It was working fine but now all of a sudden it just shows blank screen. From the moment I press power button, it just shows blank screen It doesnt even show Compaq logo on the startup. I can hear the windows music when logging in but its just blank screen. I tried choosing BIOS option on the startup by pressing F10 but it gives me a beeping sound.Can anyone tell me what is wrong with my laptop?

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