My Alienware takes 5 to 10 minutes to start to BIOS

I repair laptops and I cant fix my alenware. It takes 5 to 10 minutes to start to bios or for the screen to come on and after that it works great for days if left on and then if you restart it the laptop comes right on but if you leave it off for 5 minutes it takes a long time for the screen to boot to bios. I have reflowed the chips swaped video cards and ram still does the same thing. Does anyone have any ideas what else I could try.
Thanks Jamie
 
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