How to replace hdd with error 7? Please Help!!

I xbox is showing an error seven. i read that only way to fix it is to get a mod chip and a new hd. I bought a xecuter 3 chip with solderless adapter. i installed the chip and flashed it with x3 bios. i have a stock xbox hd out of another machine. how can i use this on my chiped xbox with the error 7?

 

If you have chip installed you should be able to boot to Slayers or AID.

 

i would just upgrade the hd if i was u, get xboxhdm and make a hd and leave it unlocked and slap it in there

 

With a modchip you don't even need xboxhdm, you can just install it and run Slayers!

 

after i flash the chip and restart it starts back up to the flash bios screen. How do i run slayer or aid from there?