Computer won't boot into anything PLEASE HELP

Jan 14, 2019
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Computer gets to a stage were you can press F9, F10 or F12 until all the ram has been loaded then won't do anything . It's a HP Compaq dc7900 convertible minitower.
I've tried everything even taking apart cleaning and putting back together.
Thankyou in advance
http://imgur.com/v3XyJqJ
 
Jan 14, 2019
4
0
10

Yes if that means taking out the battery for 5 minutes or so
 

Yes, remove the battery while the computer is unplugged. Try unplugging the computer, disconnecting the hard drive and rebooting to see if it will boot straight into the BIOS.
 
Jan 14, 2019
4
0
10


No sadly it didn't work sorry for not clarifying this earlier but I haven't been using the hard drive mostly just one I did it for a test.