My canned text for physically testing the Ram can be found below;
Previous displays and beeps I've had are
1 beep = possible system board failure and BIOS ROM checksum failure
and before a display has read
CMOS checksum error black screen
When you are able to boot into Safe Mode are the time and date shown to be correct on the taskbar.
Do you have an option in the BIOS such as "restore factory" or "most stable" settings, if yes have or can you try selecting this as a bad BIOS setting could be tripping your Ram up.
How to physically test your Ram.
The following checks require the computer case to be opened so take the following
safety precautions 1st, disconnect the power cord from the wall socket and take anti static
precautions before touching anything inside, you can do this by touching a bare metal
part of the case.
Have a pencil and notepad to hand.
Remove each stick of Ram and blow out the memory slots.
Insert the first stick of Ram in memory slot one, reconnect the power and in the case of a desktop computer the video to screen cable.
Power up the computer and see how it goes.
Make a note of the results.
Repeat the procedure until the first stick of Ram has been tested in each memory slot and the results written down.
Remove the first stick of Ram and put it to one side on top of a piece of paper with the number one on it for identification purposes.
Repeat the procedure with all Ram until each stick has been tested in all slots, the results written down and the sticks identified numerically.
Please note that some MBs (motherboards) will not boot unless there is Ram in slot one so please provide us with your motherboard details, brand, model name/number and any revision number, these details may be found by the CPU, between the PCI slots and/or around the edge of the motherboard, once we have the MB details we can look for the user manual.