Inspiron 6400, memory loss

DELL BEEP CODES
Beep Codes Beep Code Description Failure Coverage 1 System Board: BIOS ROM failure System Board, covers BIOS corruption or ROM error 2 Memory No Memory / RAM detected 3 Chipset Error (North and South Bridge Chipset DMA/IMR/ Timer Error for Intel platform); Chipset Error System Board Chipset Failure Time-Of-Day Clock test failure. Gate A20 failure Super I/O chip failure Keyboard controller test failure. 4 RAM Read/Write failure Memory failure 5 RTC Power Fail. CMOS battery failure 6 Video BIOS Test Failure Video card / chip failure 7 CPU Cache Test Failure CPU failure 8 LCD LCD failure

You could have a heat problem. Check the fan and heatsink and remove all dust from the fan and heatsink.

Could be a memory problem try removing the bottom panel, and remove both memory modules clean the contact and replace them in the slot

Hello.

Boot your system to Safe Mode (press F8 repeatedly). Go to System Restore and choose a date when your system worked OK. Note: with System Restore, everything, including your documents and other files you saved on the hard drive, will roll back to that date.

Hope this helps.

turn off, as it starts to reboot tap f8 key continually and choose safe mode. from safe mode do a system restore to last restore point before problem began.
good luck

1. Remove the battery and reinsert it. Reboot. 2. Press F2 at bootup and boot is Safe Mode.

I suggest going into the control panel/device manager and removing all the usb devices.
Restart the computer and let it find the devices again. That might help.
Also--have you tried the stick in another computer just to make sure it works?

There are two slots for memory on that laptop and it will take a maximum of 2GB of RAM. The memory type is 1.8-V SODIMM DDR-2.
The cover ont he bottom if the laptop is easy to access and add more memory.

How old is the battery? The battery is considered a consumable product. It really has to be replaced usually after a year or so. You may try updating your computer's bios software though to see if it will correct it. Updating this software is a bit risky and if not done correctly may further damage your system's motherboard.
Click this to see the instructions on how to run the update.
Click this to start the update. It can only be run though if the battery still has 30% charge. If you get an error during the update, you must replace the battery.

Most probably the seating of the processor on the motherboard is not proper
check this site and mount the processor properly
http://support.dell.com/support/edocs/systems/ins6400/en/sm/cpu.htm#wp1084976