Dead CPU, MB, both or neither?

Looking for some genius here to help me out, would really appreciate it.
I have a dead laptop.

Asus X5EA
Switch on: (with battery)
Power light on.
Batt charge light on.
DVD player makes a brief "zzz" noise.
No fans.
Hard drive makes normal sound but no activity light.
No video at all.
No attempt at post.
Power light on

Switch off: Have to pull DC power supply and remove battery to stop activity.

Switch on: (without battery)
Power light on.
DVD player makes a brief "zzz" noise.
No fans.
Hard drive makes normal sound but no activity light.
No video at all.
No attempt at post.
Power light on

Switch off: Have to pull DC power supply to stop activity.

Have stripped it down and rebuilt it twice, looking for a loose connection, everything fine.
Have cleaned off/replaced thermal paste on CPU and graphics chip and cleared dust from every nook and cranny.
Have changed cmos battery.
Have removed battery and held power button for 30 secs.

I had a feeling it was stuck on hibernate, but I've put the hard drive from the broken one into another laptop and it boots fine.

At my wits end.

I reckon it's either the CPU or the motherboard. Or both. Or neither. Aaaargh!
1 answer Last reply
More about dead cpu
  1. Do you see the MB's LED light getting turned on?if not,then it's the cpu otherwise it's the MB?does the psu's fans get started?
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