Starup problem with black screen

Dear All,
for last few weeks my 4 year old macbook 10 showing black screen at start up while I can hear fan sound and sleep light on. It would only boot after some 20 minutes after several attempts. I have done smc, pram, restarted with safe boot but no help. also hard ware test showing no problem with hardware. I have also done repair disk. after start up system behaves normally but when I shut down and again press power button to start the same problem as mentioned above - black screen, fan sound, light on but no boot sound.
is this software problem? will taking backup and reinstalling software help?? Please help.
Thanks & Regards,

light on but no boot sound.
No "chord" on startup means the Mac didn't pass it's startup diagnostics tests.
Try here > Resolve startup issues and perform disk maintenance with Disk Utility and fsck
It would only boot after some 20 minutes after several attempts.
If you can get it to boot to the desktop, check to see how much free space there is on the startup disk.
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure there's a minimum of 15% free disk space.

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Problem Event Name:    BlueScreen
OS Version:    6.1.7601.2.1.0.768.3
Locale ID:    2057 Additional information about the problem:
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BCP1:    0000000000000001
BCP2:    0000000000000002
BCP3:    0000000000000003
BCP4:    0000000000000004
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C:\Windows\Minidump\032413-20872-01.dmp
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Hello mpthemaster,
The issue you are experiencing is related to the video card, but we need to figure out if the problem lies within the hardware or the software.
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light on but no boot sound.
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Message was edited by: spudnuty

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Starup problem with black screen

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