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Dell Demension E520 not booting up

Hi all,

I'm having issues with my Dell E520. On startup it goes the Welcome screen and i get to chose guest or my name. Once i click on either one, it say logging on and them log off right away. Did this many times. I even try to reinstall windows and will give me blue screen everytime. I can't even go on safe mode.  I swamp out the memory, HD. Can this be the case of bad virus or bad Bios? I even went onlin dell and try to update the Bios but can't do it in Dos mode. HELP PLEASE! Thanks



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