I have a much loved Dell E6530 laptop that is gradually getting harder to boot. When you press the power button the power light comes on (nothing from the HDD light) and the DVD drive clunks, then that's it. The screen stays blank. If you press the power button again there's a brief whirr from the cooling fan and the laptop turns off again.
This used to happen occasionally but over the last few months has got worse. Now you have to repeatedly turn the laptop on and off again and after around half a dozen goes the laptop will POST then boot Windows 7 and work perfectly normally. (I'm currently getting round the problem by just leaving the laptop permanently on. :-)
When the problem first started the laptop was still under warranty and Dell fitted a new motherboard. However that didn't make any difference and the laptop is now out of warranty so I'm on my own. What's puzzling me is that there isn't much in the laptop apart from the mobo and I can't see what else could be causing the problem. I've tried it with and without the disk and DVD drive, with and without the battery and connected or disconnected from the charger and none of this makes any difference.
So my question is can anyone suggest what could be causing this, and specifically could it be the CPU (an i7-3720QM)? I've been toying with the idea of buying a replacement CPU on eBay to see if this makes any difference, but it's a somewhat expensive test if it doesn't work.
I haven't tried changing the memory or WiFi cards (right now I'm using the laptop every day and I'm reluctant to risk breaking it) but neither seem likely to cause this sort of problem.