Samsung R580 notebook 4 yrs old used primarily for Word docs, CMOS battery died and can't get beyond black screen (no blinking cursor even). Hope that's all that's wrong. I was told that even tho CMOS part is cheap, labor would bring replacement job to minimum of $150, and jostling a laptop over a 4 yr old period makes the machine old & other parts might go. Is that a reliable estimate...is buying a refurb Win 7 laptop an option?