HP dvd740b does not detect blank CDs and DVDs

you could use this burnaware its totally free if you dont like it just uninstall it also there are plenty of free burning sofware cnetdownload.com or majorgeeks

http://www.majorgeeks.com/BurnAware_Free_d5839.html
BurnAware Free is one of the most popular free CD, DVD, Blu-ray Disc burning software available for Windows.

Using this program you can easily create and burn Audio and MP3 CD, Data and DVD-Video disc, ISO and Cue Image,
erase or format rewritable disc, copy your CD or DVD to ISO image.

http://www.majorgeeks.com/CDBurnerXP_d4242.html
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http://download.cnet.com/active-iso-burner/3000-2646_4-10602452.html

Active ISO Burner will allow you to burn an ISO image file to CD-R, CD-RW, DVD-R, DVD+R, DVD+R DL(Dual Layer), DVD-RW and DVD+RW (including double layer, DL). Active@ ISO Burner software accepts command line parameters to automate ISO images burning process.

http://download.cnet.com/instant-cd-dvd-burner/3000-2646_4-10393316.html

Burn audio, video, and data CDs/DVDs and create and burn ISO files. Instant CD & DVD Burner is the ideal choice for anyone looking for a simple but full featured CD/DVD burner. Build and burn ISO files on the fly and compile all kinds of audio, video, and data CDs and DVDs from any kind of file (MP3, WAV, AVI, MPEG, DIVX, XVID). Instant CD & DVD Burner supports all major drives including CD-R, CD-RW, DVD-R, DVD+R, DVD-RW, DVD+RW, and DVD-RAM (SCSI, IDE, EIDE, and USB 1.0 and 2.0).

http://download.cnet.com/burn4free-cd-and-dvd/3000-2646_4-10217894.html

Burn4Free CD and DVD is a burning solution that's compatible with more than 3,000 DVD, Blu-ray and CD burners. Burn data and audio from different file types (WAV, WMA, MP3, OGG, FLAC, WavPack, and CDA). Burn and save ISO files, open and save your project to disk, verify content, print compilations, copy DVD, copy BLU RAY and import your audio compilation from M3U and ASX playlists. The drives supported include dual-layer DVD, CD-R, CD-RW, DVD-R, DVD+R, DVD-RW, DVD+RW, and DVD-RAM, BD-R, BD-RE (SCSI, IDE, EIDE, and USB 1.0 and 2.0).

http://download.cnet.com/burnaware-free/3000-2646_4-10878661.html?tag=mncol;8

BurnAware Free is a full-fledged disc burning tool - fast, lightweight, feature-packed and, most importantly, 100% free. The program burns all types of CD, DVD and Blu-Ray discs containing data, digital photos, music and video. With BurnAware Free, you will be able to create bootable or multi session CDs and DVDs, high-quality audio CDs from your collection of MP3, WAV, WMA, OGG, M4A, AAC and FLAC files, burn disc images, copy discs to backup ISO images and do a whole lot more.

http://download.cnet.com/Ashampoo-Burning-Studio-Free/3000-2646_4-10776287.html

Multi-disc file backup and restore on CDs, DVDs and Blu-ray discs; create compressed backup archives with powerful password protection; split archives automatically across multiple CDs, DVDs or Blu-ray discs; restore archive contents to their original locations; integrated Audio CD ripper store your audio tracks as WMA or WAV files; new option for setting the number of copies you want to burn (available for all disc formats); discs can now be verified immediately without being ejected first (if the drive supports this feature); numerous other small improvements that make the program easier to use and more effective; burn files and folders on data CDs/DVDs/Blu-ray discs; burn Audio CDs from WAV, MP3, FLAC, WMA and Ogg Vorbis files; burn MP3-CDs from your MP3 files; burn Video DVD, Video CD (VCD) or Super Video CD (S-VCD); create and burn CD/DVD/Blu-ray disc images; burn speed and other options can all be set automatically.

http://download.cnet.com/Macrium-Reflect-Free/3000-2242_4-10845728.html

Macrium Reflect Free Edition. An award winning disk imaging solution for free. A complete disaster recovery solution for your home and office. Protect your personal documents, photos, music and e-mails. Upgrade your hard disk or try new operating systems in the safe knowledge that everything is securely saved in an easily recovered backup file. Macrium Reflect supports backup to local, network and USB drives as well as burning to all DVD formats. This version is for non-commercial home use.

http://download.cnet.com/ImgBurn/3000-2646_4-10847481.html
ImgBurn is a lightweight CD/DVD/HD-DVD/Blu-ray burning application that has several modes, each for performing a different task: Read - read a disc to an image file; Build - creates an image file from files on your computer or network (you also can write the files directly to a disc); Write - write an image file to a disc; Verify - ensure that a disc is 100% readable (you can also have ImgBurn compare it against a given image file to ensure the actual data is correct); and Discovery - used in combination with DVDInfoPro, you can check the quality of the burns your drive is producing.

Sounds like the lens is dirty. Run a cd cleaner through the drive. That should take care of it.

solve the problem for because i want to copy cd.it has not be workink since 3 days.

try to insert disk when it in dos mode then normally log in windows

If you have the sony CD RW DVD ROM then you can't burn the data in a blank DVD.

Because your Configuration is :
Read : CD / DVD
Write : CD

This means you have a combo drive. But to burn a DVD you should have DVD RW.

the fix is usualy "upper and lower filter removal" easiest way is with filtercheck 4.6 at cdr-zone.com forums. click yes to all then reinstall your favorite burning app.

Check that the writable DVDs you are using are compatible (+/-) with your LG DVD-RAM.
Go to Windows Explorer and check to see if the Sony drive is visible. It may not be connected or the Jumper switch may be set incorrectly.
Check you have drivers installed, take a look in Hardware manager.
Sometimes, it's a little difficult to copy CDs and DVDs when you have more than one burning suite installed - for some reason, they 'just don't get along'. Try uninstalling any suites other than Nero.
Or it may just be that your LG CD-RW drive is just that, and your DVD-RW drive is just that. So it wouldn't be possible to write DVDs on the CD-RW and CDs on the DVD-RW? Though I would assume Nero would detect that and use your hard-drive as temporary storage.
In Nero SmartStart, have you selected the CD or DVD tab to correspond to the project you're burning?
                                      

Try using nero to burn, be sure to select cd as the type of media... e.g Start > all programs >> nero >> data >> nero express .. Then
select cd, data cd,, drag some pics across and burn it.. If that dont work.. i hope u got warrenty... or if you wish to keep trying let me know

Yes, you can install the cd with the Nero Software in the new Laptop, and you will be able to write CDs or DVDs, but if you have a combo only you will only be able to write/burn CDs but read DVDs no problem.
ciao Ed.

sounds exactly like my old dead drive. if it cant boot from a cd its likely a bad drive