MY MAC BOOK ONLY SHOWS A BLANK SCREEN ON START UP

THE SCREEN STAYS WHITE AFTER BEING STARTED.  NO KEY AFFECT THE SCREEN

Screen would not function after sleep
MacBook Pro Mod. A1229 running Sys 10.7.2 & Mac Software
Screen would not 'light' after a sleep period (about an hour).
Neither touching the SPACE BAR nor pressing the mouse button had an effect on the screen.  However, pressing keys indicated a computer response.
Manual SHUT DOWN by holding power key for 10+ seconds.
Restart was somewhat normal but Apple Logo and 'activity' wheel appeared slightly larger than normal and not the same brightness contrast.  After initial period the screen went 'blank' but there seemed to be some computer function - response to certain keystrokes.  Subsequent retries produced the same result.
Based on Apple Support & Mac Support groups:
1. SMC reset
2. PRAM reset
3. Boot Safe Mode
No change.
Restarted holding Command/S to get UNIX start.  The screen did function properly (my knowledge of UNIX is limited - I did NOT attempt a fix from this prompt).
Restarted from the ORIGINAL DVD that came with the machine and the START UP was NORMAL and the SCREEN was NORMAL.  This DVD was an install DVD so I used QUIT from the menu bar and the system was still functioning correctly.
Subsequent tests of the SLEEP/WAKE cycles produced normal results with no screen problems.
There are still no problems after two subsequent use periods with normal shut downs and normal start ups.

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