I Could not logon to the system

If the 2 beeps were together, then it is a check sum or memory problem.

When it boots enter the bios setup(F2) and check the system time and date (located in 'Standard cmos Settings') to see if it is correct, as this is a good indicator of a flat cmos battery (large type watch battery.)

If time and date is incorrect replace battery, if ok turn off pc and try re-setting the bios by putting the jumper on the 'JBAT1' terminal on the motherboard on pins 1-2 ont pins 2-3 then back onto 1-2; then boot pc back up and go back into the bios, set the date and time in 'Standard Cmos Settings' and then look on main bios menu for 'LOAD BIOS DEFAULTS' or similair

If non of above works, maybe you have upgraded the memory, remove it and try again with original memory stick.

Hope this is of some help

my 4600 dell does not read hard drive