[Libguestfs] KVM Image not working after expansion

Hello, I expanded a KVM image of 4gb to 10 gb .... My Host machine is RHEL 6.1 and Guest is RHEL 5.5 Command i used is: virt-resize --expand /dev/sda1 RHEL5.5-64bit.img RHEL5.5-10gb Commands successfully gets executed... Old disk works fine i mean it boots properly but the new disk stucks at GRUB... Has any one seen this behavior... What should i do to debug this problem.. -- Thanks Vipul Borikar "Our task must be to free ourselves...by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty."