Beeping at start up

Please work through this article to troubleshoot the startup.
The bios beep code can be used to diagnose the problem, as can the stop error codes from your BSOD. See links here and here.
I can't seem to access the correct medion support knowledgebase article without knowing your pc model number, but here's another link that would indicate you might have a phoenix bios, in which case see the codes associated with that. Or you could look up your bios in the specifications for your system here.
If you narrow it down and want further help, post back with the results...

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

Check your motherboard manual or download a pdf document from the manufacturer. Read the section detailing post beep error codes. If you cannot find the manual anywhere start removing all but basic hardware until your computer boots. IE CD's external graphics cards/modems/network cards/ disconnect usb hubs from the board./Ram sticks Its helpful if you have replacement hardware laying around for testing or another computer that you can borrow from to ascertain the exact problem your experiencing. Somthing has failed in your machine and it's probably RAM. Your hard disk may have failed but even so that would not prevent the motherboard from posting.