Seems to me one of the ram modules may be bad or may not like being mismatched.
Most important things to note when installing ram:
1) NEVER touch the pins on the chip with your fingers, always hold the modules by the sides of the wafer.
2) ALWAYS be wary of ESD, make sure you are grounded or at least not wearing socks on the carpet when opening your computer and accessing ram.
3) It's not necessary, but most ram problems come from mismatching chips. Most ram today is sold in dual channel, 2 module packages (6 gb max ram usually forgoes this), but Macs seem to prefer matched module sizes. That said, I've installed a 4gb module with a 2 gb module in a computer one generation older than the one you listed and had no trouble at all.
Re-seating the ram is merely popping the modules out of the socket, perhaps blowing out the socket with a can of compressed air, then re-installing them carefully and evenly, being sure they are flat, flush, and fully inserted into the socket. Perhaps try running the 4gb module by itself and see if the problem persists. It may be that one of the original modules was damaged during your installation and could be causing the problem as well.
Good luck and let us know what you find.
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I went into terminal to find out the wake reason...this is the code showing so I have copied it.
Michael-Sius-MacBook:~ michaelsiu$ syslog |grep -i "Wake reason"
Wed Jun 13 15:50:19 Michael-Sius-MacBook kernel[0] <Debug>: Wake reason = OHC1 EHC1
Wed Jun 13 15:50:28 Michael-Sius-MacBook kernel[0] <Debug>: Wake reason = OHC1 EHC1
Wed Jun 13 15:51:54 Michael-Sius-MacBook kernel[0] <Debug>: Wake reason = OHC1
"OHC: stands for Open Host Controller, is usually USB or Firewire. If you see OHC1 or OHC2 it is almost certainly an external USB keyboard or mouse that has woken up the machine."
I do not have anything external attached to it?
da Michael
Any further help anyone? Thank you
da Michael