dell inspiron 3520 hibernation problem

i have upgraded my dell inspiron bios to latest version that is A10 a few days ago . i have never upgraded my bios before. Due to some problems i reinstalled my windows 7 from dell Reinstallation dvd. After that i encountered series of problem. whenever i hibernate ,before resume i got an error msg that "your system firmware does not preserve the system memory map across hibernation transition. another problem is when i put my laptop to sleep sometimes it does not wake from sleep. The power led will remain stable and no  other led will blow but i can hear the sound of hdd and fan working as normal. during this time i have checked connecting to external lcd  tv using hdmi but this doesnot work.

what should i do and i also forgot my system's default bios version.

DELL inspiron 3520

ram -4gb

hdd-Toshiba

Current Bios version-A10