Hi @jayhernandez
Does it do this with the charger connected, you didn't say?
Try a full power refresh in case it is a corrupted BIOS and check if that resolves the problem.
I realize that you said that you said “…I've reseated the battery,” but sometimes it is necessary to also remove the RTC battery (Real Time Clock) from the motherboard as well to reset the BIOS back to its default state.
Here’s the procedure:
a). Disconnect the charger from the laptop if connected.
b). Disconnect the main battery from the motherboard.
c). Disconnect the RTC coin cell battery from the motherboard.
Here’s the service manual for the laptop as linked by you. Go to p.46 & p.47 to view the necessary pre-requisite steps and then the procedure to remove the RTC battery and the main battery respectively.
When the RTC battery is removed measure its voltage. If it is <2.6V DC replace it. Search online for Alienware 15 R3 cmos battery, to find suppliers of the part. (cmos battery = RTC battery)
d). Press and hold the laptop's Power button for a full 30 seconds and then release it
e.) Reconnect the RTC battery (or its replacement) and the main battery.
f). Reverse the above to re-assemble the laptop.
g.) When the laptop is completely re-assembled, connect the charger and try to turn on the laptop.
If it starts OK there may be a message about the date and time being incorrect. This is normal as the BIOS has been completely reset back to its default settings. Once the date and time have been adjusted the message won’t appear the next time that the laptop is started.
If you had previously changed any user defined settings in BIOS to suit whatever specific hardware configuration that you had for the laptop, then these will have to be set again.
4 
1 
366 