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On XP you can try this: Boot computer and press Ctrl+Alt+Delete twice when you See Windows welcome screen / login screen. It'll show classic login box. Now type "Administrator" (without quotes) in username field and leave password field blank, press Enter and you should be able to login Windows. Now you can reset your account password from "Control Panel -> User Accounts".
boot sequence in bios needs changeing if its not irrepairably damaged. some pc's get into bios by pressing F2 whilst booting ,there you will be taken to a screen where you can move using the "tab" or arrow keys up down left right etc some pc;s reqiure bios password i hope yours is not one of them get to know this screen and save and exit if you are happy look for "boot sequence"---hard drive --cd,rom --etc then adjust to first booting device hard drive--again use enter keys or tab to change values-get to know this screen an its functions
is it a windows password or poweron password? you must be wondering what are they? windows password is when you have to enter the password to get into windows and before that you get to see the windows loading screen. poweron password is hard to crack, it will ask a password on a black screen saying Enter a Password, and the background will be completely black in color. if its a windows password, press the "Alt+Ctrl+Del" twice, you'll get a screen which will ask you a username and password. in the username and password type in, "Administrator" and password will be blank. hit enter. if it works, then for the rest of the steps, mail me at L2support.email@example.com
when makes changes on memory ...always reinstall .and first go to bios and restore factory defaults ...optimal factory defaults ... this will do to recognize the new modules ...and installing will aware the system about the changes..
You can boot from XP cd. When prompted..press [R] this will launch recovery console. Choose your windows installation (typically by pressing  press return.. When prompted for password type chkdsk /r Press return..Windows will fix errors..type Exit and press return.. Let me know if that helps.
basing on the information you have given here are the possible solutions:
remove any external device connected to your system (printer, external hard drive and others) if removing this does not work and still gets a blank screen with blinking cursor try to go to safe mode with networking. if successful try to download the driver for your video adapter.
when you try to start the computer , do get anything on the screen like a logo? when does the blank screen occurs, is it during the turning ON of the computer or during the windows xp logo appears on the screen?
a blank screen could be caused by the following: defective video adapter, corrupted video driver, defective memory, unknown device causing the issue like the hard drive, optical drive or other peripheral installed inside the computer.