Blackscreen cold start workaround and software conflict

I, too, have the black-screen on cold-reboot problem, and resetting the PRAM is the best solution I have found, save this one: when I start, I always choose my startup disk by holding down the [option] key during reboot. This lets me choose the windows partition, the mac partition or the external mac partition on my firewire drive (I replaced my hard drive within a week of purchase.) If this fails, and it does 5% of the time, resetting the PRAM multiple times always brings it back.
Initially, I had the problem when I took the Macbook in for the superdrive not accepting most disks issue, and the system failed to reboot at the Genius bar (if it's gonna happen, better it happens on their time, not mine.) After a week, a new logic board and a new optical drive, I can definitely say this is a firmware problem, not a hardware problem. I have done a complete reinstall of the OS, erasing windows, and the problem has not resurfaced since. I am pretty certain that the issue is in a firmware conflict between OSX and MS Windows. Since I only need to use Windows once a month for a specific task, I put my windows installation on a small (30 GB) SATA drive that lives in a desk drawer for 27 days a month. When I need to use it, I swap hard drives.
Windows seems to be causing the conflict here, because when I do have the black screen, if I [option] on startup and use the Windows installation, the machine works fine (except that it is running Windows). No PRAM reset is needed to use the Windows side of the machine.

there are two different suggetions in the forum on how to fix this anoying problem. I tried both. dont know which one helped, but since I applied the "fix" two days ago, the problem has been absent.
What to do:
Fix 1) Start up from the original apple dvd (insert the dvd and hold down the "c" key under start up). When the loading is over - DONT START the software install but under tools choose start-up disk, and choose the hard disk system folder. Then simply choose restart.
Fix 2) In system preferences togle the screen settings away from the standard setting to some other setting, and then back again.
Voila.. so far it seems to work. The explanation is, that resetting the p-ram (optioncommand+pr) deletes some default preferences, that undortunately then are missing.
But the above fixes...fixes that

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Message was edited by: Awumba

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Signature:
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HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
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HP Photosmart 7520 AIO
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