Compaq Laptop won't boot

My daughter's Compaq Presario 1700 laptop (model #17XL4) won't start.

It had been working fine on battery when she noticed the battery was getting low.  She plugged in the A/C power adaptor and the system immediately shut down.  The documentation with the laptop says this should not be done while the comp is turned on, and she forgot.  

Now, when attempting to power up, the hard drive starts to spiin, the screen shows a wash of backlighting, which I think indicates that it is getting power but no signal.  There is no post beeps and the fan doesn't start spinning.

Some other posts on this site say that if the fan doesn't start, then the laptop will not post.  Some others say that the fan only spins when needed.  I am not sure but suspect the motherboard, power supply regulator, CPU or memory may be fried, but don't know how to track down the problem.  I have checked the hard drive in another comp and it works fine.

Can you suggest where and how to look next?  Or, is this a deader?
MarceusAureliousAsked:
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tim_quiConnect With a Mentor Commented:
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tim_quiCommented:
Remove the RAM modules, press the power button, does it beep?  No beeps with RAM removed usually means bad motherboard.

Have you tried running it with the battery removed and just on ac power?
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MarceusAureliousAuthor Commented:
Had already tried removing the ram and attempting a post to see if it would beep.  Same response.  I feared that the motherboard was bad.  Had also tried starting without the battery.  This didn't work either.  If the motherboard is bad, is the cost too great to warrant trying to repair it?  This laptop is about five years old.
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tim_quiCommented:
That deal that ends fast needs to have the power jack re-soldered to the mobo.  
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MarceusAureliousAuthor Commented:
Yes, it is a DIY.  I was too late for the first deal, but will monitor the site.  
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