My Laptop keeps booting straight to BIOS

Hello everyone, i must commend this forum 'cos it has been very useful even as an intern in an IT firm i have been able to learn alot in the past few weeks courtesy of u guys. My ACER AspireOne keeps boots straight to BIOS everytime, i have checked for sticky keys(there was none), i even set it to boot from HDD(it still does the same thing). Been on this for quite sometime now. Plz can anybody help me? Really stuck here. thanks.

Run a few Startup Repairs to see if it finds anything.

Check for the a newer BIOS update. If none reset the BIOS to defaults, taking note first of SATA controller setting which optimally should be AHCI.

If this is the factory install then that's the worst possible install of Win7 one can have. I'd strongly consider doing what most tech enthusiasts do and Clean Reinstall Windows 7.

At the minimum I'd Clean Up Factory Bloatware.

If those don't help then work through the Troubleshooting Steps for Windows 7.