x32 bit Operating system can not use more than 3,5 Gb. That is problem. But there is no difference between 3 Gb and 4 Gb RAM if you not opened 15-30 windows (programs) in one time.

ENG: If you hear Phoenix BIOS signal (beep) such as 1 long & 2 short - on Black screen - It means that you have videoard GF 8400M G problem (BGA balls on G86 videochip). Solution: 1) Change chip on service (expensive) 2) Home repairing: use heat (hot air) gun with temperature 220-230 C degree fo...

You should install driver for Bison webcam (BisonCap ver.1.29 / NB Pro). I'm using FTS_BisonWebCam64Bit__1017818 - available on Fujitsu website. If u need I can send to you by e-mail. It is working on Windows 7 x64 and Windows 8 x64 also.

If your system x32 bit. Your will not get 4 Gb.
If your system x64bit you have to check BIOS (RAM 4Gb) or update BIOS version.

Same problem. GF 8400M with defect (Nvidia factory defect). Keep notebook on (with black screen) - for 1 hour. After that switch off and leave it for 30-40 minutes. After that it will work (may be) - for 5-10 rebooting. Then you get same problem again & again... Better if you change G86M (Nvidia...