Problem regarding sound

Unfortunately, other solution, as good hearted as it is, won't solve the problem as laptops dont have a sound card it is onboard, so check that your notebook doesnt need the realtek high definition sound driver, apologies if you already installed it. Go to My computer>right click>properties>hardware tab>device manager and look down the list at sound video and game controllers, click '+' sign and check that the realtek is listed there, if there is an exclamation mark against sound the drivers are not installed correctly. Run this diagnostic test, click Start>run, then type 'dxdiag' and press enter, go to sound tab and let windows do a driver check. If all drivers are in place as other solution said check it is not muted, there should be a speaker icon in taskbar, right click, volume properties and make sure it is not ticked 'mute'. If all that is ok then the onboard sound may be damaged. Check in the bios in boot up press F2 or Del dependant on bios and go through all the menus and check for onboard sound and that it is enabled, if so then the motherboard sound is faulty, and only a new board can solve it unfortunately.

Does the headfone jack work? if it does, the speakers are somehow unplugged/not working. If the headfone jack doesn't work, and all the drivers are installed, you either have a loose sound card, or you simply need a new one. P.S. before you chuck the old sound card, make shure its not muted, and that the volume is up. Good luck!