I was wondering if there was any way to put the bluetooth adapter on my pc in discoverable mode?

The following assumes you are using the bluez stack.

Run hciconfig to show you the current devices (and status)

$ hciconfig
hci0: Type: USB
BD Address: 00:11:XX:XX:XX:XX ACL MTU: 678:8 SCO MTU: 48:10
UP RUNNING PSCAN ISCAN
RX bytes:2631 acl:19 sco:0 events:83 errors:0
TX bytes:1336 acl:19 sco:0 commands:48 errors:0

If you have PSCAN and ISCAN enabled, the device should be discoverable. If these are not present you can manually enable them with

$ hciconfig hci0 piscan up

You should then be able to search with eg a mobile phone/PDA and find your PC.

To make the change permanent edit /etc/bluetooth/hcid.conf and add the lines

pscan enable;
iscan enable;

I hope this helps you make a step in the right direction
(Although I'm wondering if iscan is deactivated after a while to protect from attacks)

Hugh

Thank you. My mobile was able to detect my computer and I was able to transfer the files I wanted. I still haven't been able to pair the two but I have found some bug reports on the issue i am having and hopefully I will find a work around.

I just wanted to say thanks to Que_273 for the solution. It helped me as well. I see my pc and I'm able to send files from there but my phone gets rejected when it sends a file. Im using a motorola v3x (non-brand).