By Edwin Chan SAN FRANCISCO (Reuters) – Hewlett-Packard Co posted a surprise increase in quarterly revenue after sales from its personal computer division climbed 12 percent, but a flat to declining performance from its other units underscored the companys uphill battle to revive growth. HP sales rose a mere 1 percent to $27.6 billion in its fiscal third quarter from $27.2 billion a year earlier. Wall Street analysts had forecast a modest drop in revenue to $27.01 billion. Its trying to reduce a reliance on PCs and move toward servers, storage and networking for enterprises – part of Chief Executive Officer Meg Whitmans effort to return the sprawling company to growth.