Laptop not booting

[fuzzy logic]

Hello tech gurus,
I've a 3 year old Acer Aspire 5000 series notebook having 2RAMs of 256MB and 512MB. Out of curiosity i opened the laptop on removed 512MB RAM. I switched on the laptop but i'm getting a message "Windows in resuming...." and windows XP is not booting Your help is urgently required.

[T.J.]

Power down your system. Press and hold your power button till it does that,
and then power up. Press F8 during the 'black screen' that is right after
your first BIOS screen. (Pressing many times is OK) The menu you see there
will have Safe Mode as a choice. Start that, then restart again normally.