this is what I did, my new laptop came with 2gb of memory, so I added a new 2gb module to bring the memory up to the maximum allowed for this model of 4gb. The system recognizes the new memory and shows a total of 4gb, and I did a memory diagnosis and that checked out ok. The problem is after I installed the memory, I noticed that while running on battery (not A/C) when you press the power button there is a 5 second delay before the power button light illuminates and the computer starts to boot. When the laptop is on A/C power and you power up the laptop the power light instantly comes on. The 5 second delay only happens while on battery. Also even though there is a delay the computer boots and runs fines, no problems at all running on battery. Seems like something happened when I installed the new memory, could this be a hardware problem, like something shorted out when I did the memory upgrade. Any help would be appreciated. One more thing, HP suggested I do a system restore, so I backed up my system and restored to factory, with no change.