iMac (updated Snow Leopard)

Thank you for your reply to my question.

My iMac is: iMac 7.1

OS is : OS 10.6.8

I have Intel 2.4 GHz Intel core,

Hard drive is 4 GB 667 Hz DDR2 SD Ram

Do you need serial number?

Update - After recent OS update, number pad works.

CD - still work via ITunes

When I place blank DVD+RDL DVD there is no response; DVD then ejected.

I wrote iwork (word version) files to a DVD+RDL ( 8x; 8.5 GB); when placed in slot, no response, then

DVD ejected.

I welcome any thoughts or suggestions. I don't now subscribe to Apple Support. Should I contact them, using the $40.00/problem fee(or so I heard)?

Thank you in advance for your help!

PS - Screen is 20 inches, if this helps.

Reset I reset SMC and NVRAM/PRAM. Initially was able to read my 'burned' text file DVD.

Tried to read it again (just checking) - unsuccessful (DVD not shown on desktop). When I open

DVD player app, get error message, "Supported Disc not available."

System Preferences: What do I set when 'burned' or movie DVD is inserted. I believe I should open iDVD

when I load blank DVD.

Thoughts or suggestions from here?

Thank you for your suggestions and efforts.

Baltwo

Thanks for those settings, which I copied.

Still, however, when I load blank DVD or burned DVD,

the disc symbol doesn't appear on my desktop, DVD Player

doesn't open, and I don't get a query about what to do with my

'burned' DVD (which has text files).

I tried to re-load Snow Leopard OS from the DVD I have: Nothing!

I went to disk utilities, for the hard drive, repaired disk permissions,

then verified them (using disk utilities) all successfully.

Do you or does anyone else have suggestions about how to proceed?

Is there a way to check DVD hardware? Do I need to do that? I'm lost...

Snoshu

Thanks for your efforts and suggestions, Baltwo