Removing power cord while asleep doesn't kill it, but it does if its on...?

Question

My Macbook dies when I remove the power cord even with the battery fully charged. However it doesn't die if I remove the power cord when it's asleep, and it remains asleep. Does anyone have any ideas on how I can fix this? Thanks.

Answer 1

I've just spoken to Apple support who recommended resetting the SMC. Unfortunetely that has had no effect.
This is the information from 'power' in the system profiler:
Battery Information:
Model Information:
Serial Number: xx-xxxxxxx-xxxx-xxxx
Manufacturer: DP
Device name: ASMB013
Pack Lot Code: 0001
PCB Lot Code: 0000
Firmware Version: 0102
Hardware Revision: 0300
Cell Revision: 0100
Charge Information:
Charge remaining (mAh): 3910
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 3910
Health Information:
Cycle count: 47
Condition: Good
Battery Installed: Yes
Amperage (mA): 0
Voltage (mV): 12511
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: No
Battery Power:
System Sleep Timer (Minutes): 15
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 5
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
Charging: No
Any help will be greatly appreciated...
<Edited by Moderator>