[acewin]

well its not actually chipset issue but a general laptop build issue I will say. Battery life certainly dips after long usage and its already 9 months for ur lappy.
Flickering and all, u need to get it checked from HP support, its under warranty, it would be always best u get to know what problems u r getting before that warranty expires.

PM45 is stable chipset for lappys, is ur lappy getting heated alot even in normal usage. The heat can cause damage to the chipset(mobo and eventually will show up on screen and different places., have u got a laptop cooler if not then buy one.

Also it will be wise if you get the dust which wud have accumulated through the heat vent cleaned up