Sharing a common fault :

Dell M5110 power on , does not display , sometimes display , then seven times alarm , checked that the reason is virtual welding under north bridge . removed north bridge and reballing to install well .  the fault was solved . If we do not reball and only heating directly . it also will work , but only can work for a period of time , then it will be same fault again , so it had better to reballing . Your loyal friend - Pinkney , http://www.htic-tool.com 


from  https://plus.google.com/b/107329939332162905445/+Htictoolchipset/posts