aslamualikum bhai jan

bhai mery pass p.4 system ha aur 2 hard disk ha pta nhi kya hua aur meri 2no hard disk ab lgao to error ata ha ik to bios me show hoti ha par dosri show nhi nhi hoti aur hard disk error ata ha aur restsrt karny pe vhi msla kya karo help me jo bilkul kam nhi kar rhi wo 120 gb ha aur jo show ho rahi ha wo 40 gb ha help me