I have the following certifications:

DELL Customer Induced Damage
DELL Foundation 2010 Desktops
DELL Foundation 2010 Portables
DELL Inspiron 1090
DELL Inspiron 2305/2310
DELL Inspiron 5423/14z
DELL Inspiron One 2205
DELL Microsoft Windows 8
DELL Onsite Troubleshooting
DELL Precision M4600/M6600
DELL Pro Support for Retail
DELL Wireless Technician

I have experience working with:
Lenovo Thinkpad W510
Lenovo Thinkpad W520
Lenovo Thinkpad W530
Lenovo Thinkpad L530
Lenovo Thinkpad T60
Lenovo Thinkpad T60p
Lenovo Thinkpad T61
Lenovo Thinkcentre 8810
Lenovo Thinkcentre 9645
Lenovo Thinkcentre 8212
Lenovo Thinkcentre 8187
Lenovo Thinkcentre 8141
Lenovo Thinkcentre 6792
IBM Thinkcentre 8189
IBM Thinkcentre 6072
IBM Netvista 8305
IBM 4800 POS
IBM 4900 POS
IBM SurePOS 742
HP Thin Client 5740E