computer problem. black screen no signal, beeping

my parents have this problem with their computer.
at first when turned it on it was a black screen saying the computer was not shut down properly. my dad told me he just clicked start normally. then when it came back on it had this problem. when turning on the computer the monitor says no signal and then goes black. there are 2 beeps. the 1st seems like a short/medium beep and the 2nd one is a longer beep.
the computer is an HP.
what does this mean?
sometimes they use this computer for internet, but mostly my dad uses it for games. just simple games like casino.

 

I wanted to answer myself.
it looks like everything is good this morning.
I opened up the side of the computer to see if I could identify the RAM. the RAM are the 2 pieces that fit into slots? I undid the one pulled it out and put it back in and clipped it back in. don't know if that did anything.
I turned on the computer this morning and it gave me 2 options. either start normally or start with repair (recommended). so I started it with repair. it said it was attempting to repair and may restore the computer to an earlier version. after doing all that it looks like it repaired itself, because I was then able to start the computer again and everything looks the same as it was before.
I would still like to get some thoughts as to what could have happened? and is this something that seems to be totally fixed? or should I be watching for things to happen again?

 

Hi my friend , either your ram wasn't plug well or something is demaged from windows files and repair process solved your problem :wave