TS1884 white screen appears during power on and a sound other then the start up sound. Piano key sound low tone.

After a long delay text shows up on a black screen : No bootable device -- insert boot disk and press any key  - what do I do to get the MacBook Pro to start up?

Hello,
Try CMD+r key at bootup, anything show up?
Try alt or option key... any boot devices show up?

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    Try:
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    Hello!
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    My screen has gone blank on startup and occasionally a grey folder with a question mark appears. I have tried rebooting either by pressing the start up with power or pram.. Neither attempts have worked ! My iMac is 2008. Please help :)

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