My Dell vostro 1510 starts bt the hard drive is nt detected.......I hav tested the hard drive, it's all right....plzz help!!

original drivers can detect microphone here is the link to download.
http://www.dell.com/support/home/us/en/04/product-support/product/vostro-1510/drivers

The error code indicates that the system is not able to access or detect any Hard Disk Drive.
If comfortable you can try the following:
1. Open your laptop following the below guide
2. Look for the Hard Disk Drive
3. Remove it from the system
4. Re-seat the Hard Disk drive
5. Re-start the system

If still the HDD is not detected I am afraid to say that the Drive is gone bad and needs a replacement.

Kindly feel free for any further clarification or assistance.

How to take apart Dell Vostro 1510 notebook

Press key and the power button to initiate testing PSA diagnostics. If your hard drive is bad you will get an error code..This diagnostic will check the hardware of your laptop.

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect your hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd have secure connections and are not faulty even the electic extensions or just replace them they are probably faulty a computer needs its connections to have an end so any faulty leads will end up with a computer error hope this helps
don

Might be:
- your power supply is dying
- corrupt boot files
- hard drive is dying.
Please list more symptoms

That is the sign of a bad hard drive, or your OS being erased.

Run Dell Diagnostics

When the DELL™ logo appears, press <F12> immediately. Select
Diagnostics from the start menu and press <Enter>.
Run Hard Drive test

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If the hard drive doesn't detect in multiple systems that if generally accepted as an indication of drive failure (Especially if another drive is seen in both systems) Fortunately, replacement drives are pretty cheap
http://cgi.ebay.com/320GB-Dell-VOSTRO-1000-1310-1400-1500-1510-Hard-Drive_W0QQitemZ250576402713QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a57847919#ht_5020wt_939

try to get the driver from http://support.dell.com/support/downloads/index.aspx?c=us&cs=19&l=en&s=dhs&~ck=GuidedPathHomePage

Boot to the system BIOS and ensure that a Bluetooth card is actually installed and seen by the system. I'm pretty sure bluetooth is a option on the 1510 and you may not have a BT card.