Having problems with your Toshiba Satellite A105-S4004 Notebook ?

Memory slot issue. When I put memory modules into both slots the screen doesn't start up. Tried with just one memory module and it works fine. It seems like only one of the slots have an issue.

Answers :

OK bud you got 2 slots on this thing.  Lets call them slot A & B.  Install one RAM board in slot A and turn on your computer to see if it works.  Work?  If yes then power down and take the RAM board out of slot A and set the RAM board off to the right.  Now take your other RAM board and insert in slot A again and power up the laptop.  Don't work?  Well then, you got a defective RAM board.  But if this RAM board works also, then your RAM boards are good.  Now try them out individually in slot B.  If they don't work individually in slot B, then you know slot B is fu.k.d up.  Also, check to see if you got the correct #s on the RAM and that you haven't exceeded the laptop's specifications for max ram.
First check to make sure you are using PC2-4200 modules. If not, switch them out.
\015\012Check to see if you have upgraded to BIOS 5.90.
\015\012This BIOS version will fix the issue.
\015\012Also, a checksum error happens after a BIOS update is performed, so don't worry about it. You can verify the BIOS update was successful by pressing F2 when the unit is on the Toshiba splash screen right after you turn it on. This gets you into the BIOS menu. On the Main tab, it should get you a BIOS version number. It should read 5.90.
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